water travel vs voyage

water travel and voyage both are nouns.

Word	Noun	Adjective	Verb	Adverb
water travel	Yes	No	No	No
voyage	Yes	No	Yes	No

As nouns, voyage is a hyponym of water travel; that is, voyage is a word with a more specific, narrower meaning than water travel:

Other hyponyms of water travel include ocean trip, sailing, boating, yachting.

water travel (noun)	voyage (noun)
travel by water	a journey to some distant place
	an act of traveling by water

water travel (verb)	voyage (verb)
	travel on water propelled by wind or by other means