pavement vs tarmacadam

pavement and tarmacadam both are nouns.

Word	Noun	Adjective	Verb	Adverb
pavement	Yes	No	No	No
tarmacadam	Yes	No	No	No

As nouns, tarmacadam is a hyponym of pavement; that is, tarmacadam is a word with a more specific, narrower meaning than pavement:

pavement: material used to pave an area
tarmacadam: a paving material of tar and broken stone; mixed in a factory and shaped during paving

Other hyponyms of pavement include asphalt, concrete, blacktop, blacktopping, macadam, tarmac.

pavement (noun)	tarmacadam (noun)
the paved surface of a thoroughfare	a paved surface having compressed layers of broken rocks held together with tar
walk consisting of a paved area for pedestrians; usually beside a street or roadway	a paving material of tar and broken stone; mixed in a factory and shaped during paving
material used to pave an area