ultimate vs proximate

ultimate is a noun but proximate is not a noun.

Word	Noun	Adjective	Verb	Adverb
ultimate	Yes	Yes	No	No
proximate	No	Yes	No	No

ultimate (noun)	proximate (noun)
the finest or most superior quality of its kind

ultimate (adjective)	proximate (adjective)
furthest or highest in degree or order; utmost or extreme	closest in degree or order (space or time) especially in a chain of causes and effects
being the last or concluding element of a series	very close in space or time