footer vs traveller

footer and traveller both are nouns.

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

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

Other hypernyms of footer include traveler.

footer (noun)	traveller (noun)
a printed note placed below the text on a printed page	a person who changes location
a person who travels by foot
(used only in combinations) the height or length of something in feet