pavement vs walkway

pavement and walkway both are nouns.

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

As nouns, walkway is a hypernym of pavement; that is, walkway is a word with a broader meaning than pavement:

pavement: walk consisting of a paved area for pedestrians; usually beside a street or roadway
walkway: a path set aside for walking

Other hypernyms of pavement include paseo, walk.

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