zebra crossing vs crosswalk

zebra crossing and crosswalk both are nouns.

Word	Noun	Adjective	Verb	Adverb
zebra crossing	Yes	No	No	No
crosswalk	Yes	No	No	No

As nouns, crosswalk is a hypernym of zebra crossing; that is, crosswalk is a word with a broader meaning than zebra crossing:

zebra crossing: street crossing where pedestrians have right of way; often marked in some way (especially with diagonal stripes)
crosswalk: a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other

Other hypernyms of zebra crossing include crossing, crossover.

zebra crossing (noun)	crosswalk (noun)
street crossing where pedestrians have right of way; often marked in some way (especially with diagonal stripes)	a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other