hard hat vs artificer

hard hat and artificer both are nouns.

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

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

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

hard hat (noun)	artificer (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.	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.