Which to use
“placid” is an adjective and “plasmid” is a noun - they look or sound alike but fill different roles in a sentence.
- #28,671
- “placid” frequency rank
- #42,823
- “plasmid” frequency rank
- 71494
- confusion score
Side-by-Side Comparison
| Feature | placid | plasmid |
|---|---|---|
| Definition | calm and quiet; peaceful; tranquil | A loop of double-stranded DNA that is separate from — and replicates independently of — the chromosomes; such loops are most commonly found in bacteria, but they are also sometimes found in archaeans and eukaryotic cells, and they are used in genetic engineering as a vector for gene transfer. |
Where the eye mixes placid and plasmid
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence.
Why the eye confuses placid with plasmid
These two trip readers on the page rather than in the ear: placid is /ˈplæs.ɪd/ while plasmid is /ˈplæzmɪd/. 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 71494, derived from the frequency rank of both members and their visual similarity.
placid is recorded at frequency rank #28,671, classified as anadj, pronounced /ˈplæs.ɪd/. plasmid is at rank #42,823, tagged as anoun, pronounced /ˈplæzmɪd/.
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 71494, this pair ranks #46,469 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of placid vs plasmid
Shared letters: adilp. Private to "placid": c. Private to "plasmid": ms.
"placid" · 6 letters · shape CCVCVC · "plasmid" · 7 letters · shape CCVCCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "placid" for "plasmid" ever safe?
Frequency check: "placid" vs "plasmid" - which ranks higher?
After this comparison
Eye-level mix-up between "placid" and "plasmid" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "placid" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "plasmid" - compare definitions side by side with the headword page. Word entry
- This pair ranks #46,469 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "placid" and "plasmid" also get mixed up with nearby pairs, the highest-scored neighbour is "placard vs placid". 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 #46,469 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.