Which to use
“fem” and “femur” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #33,233
- “fem” frequency rank
- #28,920
- “femur” frequency rank
- 62153
- confusion score
Side-by-Side Comparison
| Feature | fem | femur |
|---|---|---|
| Definition | Synonym of femme. | A thighbone. |
Where the eye mixes fem and femur
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. fem runs 3 letters (CVC) against femur's 5 (CVCVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses fem with femur
A purely visual mix-up. fem (/fɛm/) and femur (/ˈfiːmə(ɹ)/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 extra letter(s) - “fem” sits inside “femur”. Our composite confusion score for this pair is 62153, derived from the frequency rank of both members and their visual similarity.
fem is recorded at frequency rank #33,233, classified as anoun, pronounced /fɛm/. femur is at rank #28,920, tagged as anoun, pronounced /ˈfiːmə(ɹ)/.
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 62153, this pair ranks #90,097 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of fem vs femur
Shared letters: efm. Private to "fem": -. Private to "femur": ru.
"fem" · 3 letters · shape CVC · "femur" · 5 letters · shape CVCVC
Known mistypes of this pair
- femur ← efmur · femmur · femru · femurr · feumr · ffemur · fmeur
Frequently Asked Questions
Is swapping "fem" for "femur" ever safe?
Frequency check: "fem" vs "femur" - which ranks higher?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "fem" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "femur" - compare definitions side by side with the headword page. Word entry
- This pair ranks #90,097 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fem" and "femur" also get mixed up with nearby pairs, the highest-scored neighbour is "fem vs FOMO". 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 #90,097 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.