tobacconist vs market keeper

tobacconist and market keeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
tobacconist	Yes	No	No	No
market keeper	Yes	No	No	No

As nouns, market keeper is a hypernym of tobacconist; that is, market keeper is a word with a broader meaning than tobacconist:

Other hypernyms of tobacconist include shopkeeper, storekeeper, tradesman.

tobacconist (noun)	market keeper (noun)
a shop that sells pipes and pipe tobacco and cigars and cigarettes	a merchant who owns or manages a shop
a retail dealer in tobacco and tobacco-related articles