follower vs traveller

follower and traveller both are nouns.

Word	Noun	Adjective	Verb	Adverb
follower	Yes	No	No	No
traveller	Yes	No	No	No

As nouns, traveller is a hypernym of follower; that is, traveller is a word with a broader meaning than follower:

Other hypernyms of follower include traveler.

follower (noun)	traveller (noun)
a person who accepts the leadership of another	a person who changes location
someone who travels behind or pursues another