building material vs artefact

building material and artefact both are nouns.

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

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

Other hypernyms of building material include artifact.

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