invalidate vs quash

invalidate and quash both are verbs.

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

As verbs, invalidate and quash are synonyms defined as:

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

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