sidewalk vs pavement

sidewalk and pavement both are nouns.

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

As nouns, sidewalk and pavement are synonyms defined as:

sidewalk and pavement: walk consisting of a paved area for pedestrians; usually beside a street or roadway

sidewalk (noun)	pavement (noun)
walk consisting of a paved area for pedestrians; usually beside a street or roadway	the paved surface of a thoroughfare
	walk consisting of a paved area for pedestrians; usually beside a street or roadway
	material used to pave an area