contend vs feud

contend is not a noun while feud is a noun.

Word	Noun	Adjective	Verb	Adverb
contend	No	No	Yes	No
feud	Yes	No	Yes	No

As verbs, feud is a hyponym of contend; that is, feud is a word with a more specific, narrower meaning than contend:

contend (noun)	feud (noun)
	a bitter quarrel between two parties

contend (verb)	feud (verb)
to make the subject of dispute, contention, or litigation	carry out a feud
have an argument about something
maintain or assert
compete for something; engage in a contest; measure oneself against others
be engaged in a fight; carry on a fight
succeed in doing, achieving, or producing (something) with the limited or inadequate means available