move back vs travel

move back is not a noun while travel is a noun.

Word	Noun	Adjective	Verb	Adverb
move back	No	No	Yes	No
travel	Yes	No	Yes	No

As verbs, travel is a hypernym of move back; that is, travel is a word with a broader meaning than move back:

Other hypernyms of move back include go, locomote, move.

move back (noun)	travel (noun)
	the act of going from one place to another
	self-propelled movement
	a movement through space that changes the location of something

move back (verb)	travel (verb)
pull back or move away or backward	change location; move, travel, or proceed, also metaphorically
	make a trip for pleasure
	travel upon or across
	undergo transportation as in a vehicle
	undertake a journey or trip
	travel from place to place, as for the purpose of finding work, preaching, or acting as a judge