macadam vs tarmacadam

macadam and tarmacadam both are nouns.

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

As nouns, macadam and tarmacadam are synonyms defined as:

macadam and tarmacadam: a paved surface having compressed layers of broken rocks held together with tar

Other synonyms of macadam include tarmac.

macadam (noun)	tarmacadam (noun)
a paved surface having compressed layers of broken rocks held together with tar	a paved surface having compressed layers of broken rocks held together with tar
broken stone used in macadamized roadways	a paving material of tar and broken stone; mixed in a factory and shaped during paving

macadam (verb)	tarmacadam (verb)
surface with macadam