construction worker vs hard hat

construction worker and hard hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
construction worker	Yes	No	No	No
hard hat	Yes	No	No	No

As nouns, construction worker and hard hat are synonyms defined as:

construction worker and hard hat: a worker skilled in building offices or dwellings etc.

construction worker (noun)	hard hat (noun)
a worker skilled in building offices or dwellings etc.	a lightweight protective helmet (plastic or metal) worn by construction workers
	a worker skilled in building offices or dwellings etc.