contention vs firestorm

contention and firestorm both are nouns.

Word	Noun	Adjective	Verb	Adverb
contention	Yes	No	No	No
firestorm	Yes	No	No	No

As nouns, firestorm is a hyponym of contention; that is, firestorm is a word with a more specific, narrower meaning than contention:

contention: a contentious speech act; a dispute where there is strong disagreement
firestorm: an outburst of controversy

Other hyponyms of contention include argle-bargle, argy-bargy, sparring, polemic, fight.

contention (noun)	firestorm (noun)
the act of competing as for profit or a prize	an outburst of controversy
a contentious speech act; a dispute where there is strong disagreement	a storm in which violent winds are drawn into the column of hot air rising over a severely bombed area
a point asserted as part of an argument