viticulturist vs grower

viticulturist and grower both are nouns.

Word	Noun	Adjective	Verb	Adverb
viticulturist	Yes	No	No	No
grower	Yes	No	No	No

As nouns, grower is a hypernym of viticulturist; that is, grower is a word with a broader meaning than viticulturist:

viticulturist: a cultivator of grape vine
grower: someone concerned with the science or art or business of cultivating the soil

Other hypernyms of viticulturist include agriculturalist, agriculturist, cultivator, raiser.

viticulturist (noun)	grower (noun)
a cultivator of grape vine	someone concerned with the science or art or business of cultivating the soil