contend vs fight down

contend and fight down both are verbs.

Word	Noun	Adjective	Verb	Adverb
contend	No	No	Yes	No
fight down	No	No	Yes	No

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

contend (verb)	fight down (verb)
to make the subject of dispute, contention, or litigation	fight against or resist strongly
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