walkway vs catwalk

walkway and catwalk both are nouns.

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

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

walkway: a path set aside for walking
catwalk: narrow pathway high in the air (as above a stage or between parts of a building or along a bridge)

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

walkway (noun)	catwalk (noun)
a path set aside for walking	narrow pathway high in the air (as above a stage or between parts of a building or along a bridge)
	narrow platform extending out into an auditorium