building material vs artifact

building material and artifact both are nouns.

Word	Noun	Adjective	Verb	Adverb
building material	Yes	No	No	No
artifact	Yes	No	No	No

As nouns, artifact is a hypernym of building material; that is, artifact is a word with a broader meaning than building material:

Other hypernyms of building material include artefact.

building material (noun)	artifact (noun)
material used for constructing buildings	a man-made object taken as a whole