trigger vs lever

trigger and lever both are nouns.

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

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

trigger (noun)	lever (noun)
an act that sets in motion some course of events	a rigid bar pivoted about a fulcrum
lever that activates the firing mechanism of a gun	a flat metal tumbler in a lever lock
a device that activates or releases or causes something to happen	a simple machine that gives a mechanical advantage when given a fulcrum

trigger (verb)	lever (verb)
release or pull the trigger on	to move or force, especially in an effort to get something open
put in motion or move to act