on tour vs travel

on tour and travel both are nouns.

Word	Noun	Adjective	Verb	Adverb
on tour	Yes	No	No	No
travel	Yes	No	Yes	No

As nouns, travel is a hypernym of on tour; that is, travel is a word with a broader meaning than on tour:

Other hypernyms of on tour include traveling, travelling.

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

on tour (verb)	travel (verb)
	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