switchblade vs flick knife

switchblade and flick knife both are nouns.

Word	Noun	Adjective	Verb	Adverb
switchblade	Yes	No	No	No
flick knife	Yes	No	No	No

As nouns, switchblade and flick knife are synonyms defined as:

switchblade and flick knife: a pocketknife with a blade that springs open at the press of a button

Other synonyms of switchblade include flick-knife, switchblade knife.

switchblade (noun)	flick knife (noun)
a pocketknife with a blade that springs open at the press of a button	a pocketknife with a blade that springs open at the press of a button