primer vs igniter

primer and igniter both are nouns.

Word	Noun	Adjective	Verb	Adverb
primer	Yes	No	No	No
igniter	Yes	No	No	No

As nouns, igniter is a hypernym of primer; that is, igniter is a word with a broader meaning than primer:

Other hypernyms of primer include ignitor, light, lighter.

primer (noun)	igniter (noun)
any igniter that is used to initiate the burning of a propellant	a device for lighting or igniting fuel or charges or fires
the first or preliminary coat of paint or size applied to a surface	a substance used to ignite or kindle a fire
an introductory textbook