millimètrevsmillimètresWhat's the difference?

Spelling & Dictionary Insight

millimètre and millimètres form a confusable pair in the French index, two distinct headwords that writers substitute for each other because they look alike, sound alike, or both. They differ by 1 extra letter(s) - “millimètre” sits inside “millimètres” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 41176, derived from the frequency rank of both members and their visual similarity.

Side-by-side the two words carry different dictionary signatures. millimètre is recorded at frequency rank #26,438, classified as anoun, pronounced \mi.li.mɛtʁ\. millimètres is at rank #14,738, tagged as anoun, pronounced \mi.li.mɛtʁ\. When the two words belong to different parts of speech, sentence grammar alone usually resolves the confusion; when they share a part of speech, only semantic context separates them, which is why the pair earns a dedicated lookup page.

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. Automated spell-checkers cannot flag confusable substitution because every member of the pair is a valid dictionary word, only the writer, or a grammar/context tool, can confirm that the chosen spelling matches the intended meaning. PlainSpell's confusable index exists precisely to make that contextual choice explicit.