switchblade vs pocket knife

switchblade and pocket knife both are nouns.

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

As nouns, pocket knife is a hypernym of switchblade; that is, pocket knife is a word with a broader meaning than switchblade:

switchblade: a pocketknife with a blade that springs open at the press of a button
pocket knife: a knife with a blade that folds into the handle; suitable for carrying in the pocket

Other hypernyms of switchblade include pocketknife.

switchblade (noun)	pocket knife (noun)
a pocketknife with a blade that springs open at the press of a button	a knife with a blade that folds into the handle; suitable for carrying in the pocket