finish vs finis

finish and finis both are nouns.

Word	Noun	Adjective	Verb	Adverb
finish	Yes	No	Yes	No
finis	Yes	No	No	No

As nouns, finis is a hyponym of finish; that is, finis is a word with a more specific, narrower meaning than finish:

Other hyponyms of finish include close, closing curtain, finale.

As nouns, finish and finis are synonyms defined as:

Other synonyms of finish include close, conclusion, finale, last, stopping point.

finish (noun)	finis (noun)
the act of finishing	the concluding part of any performance
a decorative texture or appearance of a surface (or the substance that gives it that appearance)	the temporal end; the concluding time
(wine tasting) the taste of a wine on the back of the tongue (as it is swallowed)
designated event that concludes a contest (especially a race)
the downfall of someone (as of persons on one side of a conflict)
event whose occurrence ends something
the place designated as the end (as of a race or journey)
a highly developed state of perfection; having a flawless or impeccable quality
the temporal end; the concluding time

finish (verb)	finis (verb)
finally be or do something
come or bring to a finish or an end
cause to finish a relationship with somebody
finish eating all the food on one's plate or on the table
provide with a finish
have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical