controversy vs contestation

controversy and contestation both are nouns.

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

As nouns, controversy and contestation are synonyms defined as:

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

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

controversy (noun)	contestation (noun)
a contentious speech act; a dispute where there is strong disagreement	a contentious speech act; a dispute where there is strong disagreement