walkway vs pavement

walkway and pavement both are nouns.

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

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

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

Other hyponyms of walkway include ambulatory, boardwalk, catwalk, flagging, mall, promenade, sidewalk, skywalk.

walkway (noun)	pavement (noun)
a path set aside for walking	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