Which to use
“moldy” is an adjective and “moly” is a noun - they look or sound alike but fill different roles in a sentence.
- #42,277
- “moldy” frequency rank
- #36,676
- “moly” frequency rank
- 78953
- confusion score
Side-by-Side Comparison
| Feature | moldy | moly |
|---|---|---|
| Definition | Covered with mold. | A magic herb or plant used by Odysseus to overcome Circe. |
Where the eye mixes moldy and moly
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. moldy runs 5 letters (CVCCV) against moly's 4 (CVCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses moldy with moly
These two trip readers on the page rather than in the ear: moldy is /ˈmoʊldi/ while moly is /ˈməʊli/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 78953, derived from the frequency rank of both members and their visual similarity.
moldy is recorded at frequency rank #42,277, classified as anadj, pronounced /ˈmoʊldi/. moly is at rank #36,676, tagged as anoun, pronounced /ˈməʊli/.
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 78953, this pair ranks #23,344 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of moldy vs moly
Shared letters: lmoy. Private to "moldy": d. Private to "moly": -.
"moldy" · 5 letters · shape CVCCV · "moly" · 4 letters · shape CVCV
Known mistypes of this pair
Frequently Asked Questions
Can "moldy" and "moly" be used interchangeably?
Frequency check: "moldy" vs "moly" - which ranks higher?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "moldy" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "moly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #23,344 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "moldy" and "moly" also get mixed up with nearby pairs, the highest-scored neighbour is "moldy vs mossy". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #23,344 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.