pipe fitter vs artisan

pipe fitter and artisan both are nouns.

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

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

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

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

pipe fitter (noun)	artisan (noun)
a craftsman who installs and repairs pipes and fixtures and appliances	a skilled worker who practices some trade or handicraft