pipe fitter vs artificer

pipe fitter and artificer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pipe fitter	Yes	No	No	No
artificer	Yes	No	No	No

As nouns, artificer is a hypernym of pipe fitter; that is, artificer is a word with a broader meaning than pipe fitter:

pipe fitter: a craftsman who installs and repairs pipes and fixtures and appliances
artificer: a skilled worker who practices some trade or handicraft

Other hypernyms of pipe fitter include artisan, craftsman, journeyman.

pipe fitter (noun)	artificer (noun)
a craftsman who installs and repairs pipes and fixtures and appliances	a skilled worker who practices some trade or handicraft
	someone who is the first to think of or make something
	an enlisted man responsible for the upkeep of small arms and machine guns etc.