Through vs Though vs Tough: 7 Confusing Words

English spelling can be baffling, and few examples prove it better than these seven words: through, though, thought, tough, taught, thorough and throughout. Most of them share the same four-letter sequence sitting together in the middle – "ough" – while "taught" is spelled slightly differently, with "augh" instead. Despite these similar spellings, every single word is pronounced differently and means something completely different. If you have ever paused mid-sentence wondering whether you meant "though" or "through", you are certainly not alone. This guide breaks down the meaning, pronunciation and correct use of each word, one at a time, so that you can use all seven with confidence.

Why Are These Words So Easily Confused?

Six of these seven words share the letter sequence "-ough-", while taught is spelled with "-augh-" instead. Both patterns are well known among English learners — and even native speakers — as some of the least predictable spelling combinations in the language. The letters "ough" alone can be pronounced in at least six or seven different ways depending on the word, which is exactly why words that look almost identical on the page can sound nothing alike out loud. Add to that the fact that some of these words are closely related in meaning (through and throughout), while others are entirely unrelated adjectives (tough, thorough) or verb forms (thought, taught), and it is easy to see why this group appears on almost every list of commonly confused English words. If you would like to hear each word pronounced correctly, the Cambridge Dictionary is a reliable place to listen to native British audio for any of them. You can also browse more tricky word pairs in our Commonly Confused Words collection.

1. Through – Meaning, Pronunciation and Examples

Pronunciation (UK): /θruː/ — rhymes with "blue" and "true" 🔊 Through
Part of speech: preposition, adverb
Meaning: moving in one side and out of the other; by means of something; from beginning to end

• We walked through the old town gates.
• She got the job through a friend of her father's.
• He read the entire report through without stopping once.

2. Though – Meaning, Pronunciation and Examples

Pronunciation (UK): /ðəʊ/ — rhymes with "go" and "so"; the "th" here is soft, as in "this" 🔊 Though
Part of speech: conjunction, adverb
Meaning: despite the fact that (conjunction); however, used informally at the end of a sentence (adverb)

• Though it was raining, we still went for a walk.
• I think she's right — I'm not completely sure, though.
• He's a good friend, though he does forget birthdays.

3. Thought – Meaning, Pronunciation and Examples

Pronunciation (UK): /θɔːt/ — rhymes with "sort" and "caught" 🔊 Thought
Part of speech: noun; past tense and past participle of "think"
Meaning: an idea or opinion (noun); the past form of the verb "think"

• I thought you had already left.
• It was just a passing thought.
• She gave the proposal a great deal of thought before agreeing.

4. Tough – Meaning, Pronunciation and Examples

Pronunciation (UK): /tʌf/ — rhymes with "rough" and "stuff"; here the "gh" sounds like an "f" 🔊 Tough
Part of speech: adjective
Meaning: strong and difficult to break, cut or chew; (of a situation) difficult; (of a person) resilient and hard-wearing

• This steak is far too tough to chew.
• It has been a tough week at work.
• You need to be tough to survive in this industry.

5. Taught – Meaning, Pronunciation and Examples

Pronunciation (UK): /tɔːt/ — sounds identical to "thought" without the initial "th"; rhymes with "caught" and "sort" 🔊 Taught
Part of speech: past tense and past participle of "teach"
Meaning: gave someone knowledge or a skill; instructed

• My grandmother taught me how to bake bread.
• English has been taught at this school since 1950.
• He taught himself to play the guitar.

Because "taught" and "thought" sound so similar, this pair causes more spelling mistakes than almost any other in this group. The difference is small but crucial: drop the "h" after the "t" and change the "o" to an "a" — turning "th-ough-t" into "t-augh-t" — and an idea becomes an act of teaching.

6. Thorough – Meaning, Pronunciation and Examples

Pronunciation (UK): /ˈθʌr.ə/ — "THUH-ruh" 🔊 Thorough
Part of speech: adjective
Meaning: complete and careful, paying attention to every detail

• The police carried out a thorough investigation.
• She gave the flat a thorough clean before moving out.
• He is known for his thorough, methodical approach to research.

Notice that "thorough" is the odd one out in this group: it is the only word with two syllables, and its "gh" disappears from the sound entirely.

7. Throughout – Meaning, Pronunciation and Examples

Pronunciation (UK): /θruːˈaʊt/ — "through" plus "out" 🔊 Throughout
Part of speech: preposition, adverb
Meaning: in every part of a place; during the whole of a period of time

• The theme is repeated throughout the whole book.
• It rained throughout the entire weekend.
• Fans could be heard singing throughout the match.

Quick Comparison Table: All Seven Words at a Glance

How to Remember the Difference

• Through vs Throughout: "Throughout" is simply "through" + "out". If something covers the whole place or the whole time, add the "-out".
• Though vs Through: "Though" rhymes with "so" — both are short, soft words that often trail off at the end of a sentence.
• Thought vs Taught: Picture a teacher: a teacher taught you something, and that something started as a thought in their head. The word with "th" is the idea; the word starting with just "t" is the teaching action.
• Tough vs Though: "Tough" has that hard "f" sound at the end, just like "rough", "cough" and "enough". If you can feel your teeth touch your lip at the end of the word, it's "tough".
• Thorough: The odd one out — it's the only two-syllable word in the group, and the "gh" vanishes from the sound completely.

Common Mistakes Learners Make

• Writing "I taught about it all night" instead of the correct "I thought about it all night".
• Describing a difficult exam as "very thorough" — "thorough" does not mean difficult; it means detailed and complete. The correct word here is "tough".
• Confusing "though" and "through" in fixed phrases — only "even though" is correct; "even through" is not a standard English phrase.
• Splitting "throughout" into two words, "through out" — it is always written as one word.

Test Your Vocabulary

Fancy putting your vocabulary to the test? Try our English Synonyms Quiz: 15 Intermediate Questions and see how many words – long or short – you can identify correctly. You'll also find more topic-based practice in our English Vocabulary section.

Final Thoughts

Through, though, thought, tough, taught, thorough and throughout may share the same four letters, but each one carries its own sound, its own grammar and its own meaning. The trick is not to memorise the spelling all at once but to learn each word alongside a short example sentence, the way we have done above. Say the sentences aloud; notice how differently each word sounds, and the confusion will fade with practice. If you enjoyed untangling this word group, explore another tricky word in detail on our dictionary blog: Ubiquitous: Meaning, Examples & Synonyms.