pocket lighter vs igniter

pocket lighter and igniter both are nouns.

Word	Noun	Adjective	Verb	Adverb
pocket lighter	Yes	No	No	No
igniter	Yes	No	No	No

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

Other hypernyms of pocket lighter include ignitor, light, lighter.

pocket lighter (noun)	igniter (noun)
a lighter for cigars or cigarettes	a device for lighting or igniting fuel or charges or fires
	a substance used to ignite or kindle a fire