comer vs rival

comer and rival both are nouns.

Word	Noun	Adjective	Verb	Adverb
comer	Yes	No	No	No
rival	Yes	Yes	Yes	No

As nouns, rival is a hypernym of comer; that is, rival is a word with a broader meaning than comer:

Other hypernyms of comer include challenger, competition, competitor, contender.

comer (noun)	rival (noun)
someone who arrives (or has arrived)	the contestant you hope to defeat
someone with a promising future

comer (adjective)	rival (adjective)
	as a rival in a competition

comer (verb)	rival (verb)
	be the rival of, be in competition with
	be equal to in quality or ability