plantsman vs nurseryman

plantsman and nurseryman both are nouns.

Word	Noun	Adjective	Verb	Adverb
plantsman	Yes	No	No	No
nurseryman	Yes	No	No	No

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

plantsman: an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants)
nurseryman: someone who takes care of a garden

Other hyponyms of plantsman include gardener.

plantsman (noun)	nurseryman (noun)
an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants)	someone who takes care of a garden