contestation vs contention

contestation and contention both are nouns.

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

As nouns, contestation and contention are synonyms defined as:

contestation and contention: a contentious speech act; a dispute where there is strong disagreement

Other synonyms of contestation include arguing, argument, controversy, disceptation, disputation, tilt.

contestation (noun)	contention (noun)
a contentious speech act; a dispute where there is strong disagreement	the act of competing as for profit or a prize
	a contentious speech act; a dispute where there is strong disagreement
	a point asserted as part of an argument