quash vs invalidate

quash and invalidate both are verbs.

Word	Noun	Adjective	Verb	Adverb
quash	No	No	Yes	No
invalidate	No	No	Yes	No

As verbs, quash and invalidate are synonyms defined as:

Other synonyms of quash include annul, avoid, nullify, void.

quash (verb)	invalidate (verb)
put down by force or intimidation	take away the legal force of or render ineffective
declare invalid	show to be invalid
	make invalid for use
	declare invalid