firing pin vs striker

firing pin and striker both are nouns.

Word	Noun	Adjective	Verb	Adverb
firing pin	Yes	No	No	No
striker	Yes	No	No	No

As nouns, striker is a hypernym of firing pin; that is, striker is a word with a broader meaning than firing pin:

firing pin (noun)	striker (noun)
striker that ignites the charge by striking the primer	the part of a mechanical device that strikes something
	an employee on strike against an employer
	someone receiving intensive training for a naval technical rating
	a forward on a soccer team
	someone who hits