hard hat vs craftsman

hard hat and craftsman both are nouns.

Word	Noun	Adjective	Verb	Adverb
hard hat	Yes	No	No	No
craftsman	Yes	No	No	No

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

Other hypernyms of hard hat include artificer, artisan, journeyman.

hard hat (noun)	craftsman (noun)
a lightweight protective helmet (plastic or metal) worn by construction workers	a skilled worker who practices some trade or handicraft
a worker skilled in building offices or dwellings etc.	a creator of great skill in the manual arts
	a professional whose work is consistently of high quality