You know the meme where you go "the name of [noun with a diminutive] implies the existence of [a hypothetical HUGE form of same thing, but without the diminutive]" like "existence of dorito implies the existence of THE DORO" and it's a huge-ass corn chip the size of a wheel of cheese?
Well, in finnish, the word for moth is "yökkönen", from "yö" (night), the suffix "-kko/kkö" which has many purposes but one of them is to change any word into "person involved with doing something with the root word", and the dininutive "-nen". So the name of moth is "little night creature".
But coming back to the diminutive meme, the existence of yökkönen would imply the existence of yökkö, the big (or at least medium-sized, or non-small) night creature. Through a happenstance completely unrelated to moths or other insects, "yökkö" is the finnish vernacular word for a night shift nurse.
