innkeeper vs victualler

innkeeper and victualler both are nouns.

Word	Noun	Adjective	Verb	Adverb
innkeeper	Yes	No	No	No
victualler	Yes	No	No	No

As nouns, victualler is a hyponym of innkeeper; that is, victualler is a word with a more specific, narrower meaning than innkeeper:

Other hyponyms of innkeeper include hostess, padrone, victualer.

innkeeper (noun)	victualler (noun)
the owner or manager of an inn	a supplier of victuals or supplies to an army
	an innkeeper (especially British)