catwalk vs walkway

catwalk and walkway both are nouns.

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

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

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

Other hypernyms of catwalk include paseo, walk.

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