Which to use
“thorough” is an adjective and “trough” is a noun - they look or sound alike but fill different roles in a sentence.
- #7,512
- “thorough” frequency rank
- #16,606
- “trough” frequency rank
- 24118
- confusion score
Side-by-Side Comparison
| Feature | thorough | trough |
|---|---|---|
| Definition | Painstaking and careful not to miss or omit any detail. | A long, narrow container, open on top, for feeding or watering animals. |
Where the spellings diverge
Shared letters are muted; the letters that actually set thorough and trough apart are highlighted. They share 6 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
thorough and trough form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 2 letter(s) in length - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 24118, derived from the frequency rank of both members and their visual similarity.
thorough is recorded at frequency rank #7,512, classified as anadj, pronounced /ˈθʌɹə/. trough is at rank #16,606, tagged as anoun, pronounced /tɹɒf/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 24118, this pair ranks #404,318 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Frequency comparison
Frequently Asked Questions
Can "thorough" and "trough" be used interchangeably?
Remembering thorough vs trough
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “thorough”; for a noun, it's “trough”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “thorough” entry
- Browse more pairs most likely to be confused. Most confusable