Could be easy

A word that when pluralized(?) has less letters than the original.

Originally posted by prosoccer
A word that when pluralized(?) has less letters than the original.

what about one ending in a when it becomes a plural?

like criterion / criteria?

Originally posted by prosoccer
A word that when pluralized(?) has less letters than the original.

Originally posted by prosoccer
A word that when pluralized(?) has less letters than the original.

datum/data

spectrum/spectra

-us and -um are both latin endings right? there should be quite alot of words then.
so far i like mouse/mice best 🙂