shop mechanic vs craftsman

shop mechanic and craftsman both are nouns.

Word	Noun	Adjective	Verb	Adverb
shop mechanic	Yes	No	No	No
craftsman	Yes	No	No	No

As nouns, craftsman is a hypernym of shop mechanic; that is, craftsman is a word with a broader meaning than shop mechanic:

Other hypernyms of shop mechanic include artificer, artisan, journeyman.

shop mechanic (noun)	craftsman (noun)
a craftsman skilled in operating machine tools	a skilled worker who practices some trade or handicraft
	a creator of great skill in the manual arts
	a professional whose work is consistently of high quality