contest vs repugn

contest is a noun but repugn is not a noun.

Word	Noun	Adjective	Verb	Adverb
contest	Yes	No	Yes	No
repugn	No	No	Yes	No

As verbs, contest and repugn are synonyms defined as:

contest and repugn: to make the subject of dispute, contention, or litigation

Other synonyms of contest include contend.

contest (noun)	repugn (noun)
a struggle between rivals
an occasion on which a winner is selected from among two or more contestants

contest (verb)	repugn (verb)
to make the subject of dispute, contention, or litigation	to make the subject of dispute, contention, or litigation