contend vs bicker

contend is not a noun while bicker is a noun.

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

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

contend (noun)	bicker (noun)
	a quarrel about petty points

contend (verb)	bicker (verb)
to make the subject of dispute, contention, or litigation	argue over petty things
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