blacktopping vs paving material

blacktopping and paving material both are nouns.

Word	Noun	Adjective	Verb	Adverb
blacktopping	Yes	No	No	No
paving material	Yes	No	No	No

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

blacktopping: a black bituminous material used for paving roads or other areas; usually spread over crushed rock
paving material: material used to pave an area

Other hypernyms of blacktopping include pavement, paving.

blacktopping (noun)	paving material (noun)
a black bituminous material used for paving roads or other areas; usually spread over crushed rock	material used to pave an area