quash vs nullify

quash and nullify both are verbs.

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

As verbs, quash and nullify are synonyms defined as:

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

quash (verb)	nullify (verb)
put down by force or intimidation	make ineffective by counterbalancing the effect of
declare invalid	show to be invalid
	declare invalid