insulation vs building material

insulation and building material both are nouns.

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

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

insulation: insulating material that reduces or prevents the transmission of heat or sound or electricity
building material: material used for constructing buildings

insulation (noun)	building material (noun)
the act of protecting something by surrounding it with material that reduces or prevents the transmission of sound or heat or electricity	material used for constructing buildings
the state of being isolated or detached
insulating material that reduces or prevents the transmission of heat or sound or electricity