gun trigger vs lever

gun trigger and lever both are nouns.

Word	Noun	Adjective	Verb	Adverb
gun trigger	Yes	No	No	No
lever	Yes	No	Yes	No

As nouns, lever is a hypernym of gun trigger; that is, lever is a word with a broader meaning than gun trigger:

gun trigger (noun)	lever (noun)
lever that activates the firing mechanism of a gun	a rigid bar pivoted about a fulcrum
	a flat metal tumbler in a lever lock
	a simple machine that gives a mechanical advantage when given a fulcrum

gun trigger (verb)	lever (verb)
	to move or force, especially in an effort to get something open