garden pea vs sugar pea

garden pea and sugar pea both are nouns.

Word	Noun	Adjective	Verb	Adverb
garden pea	Yes	No	No	No
sugar pea	Yes	No	No	No

As nouns, sugar pea is a hyponym of garden pea; that is, sugar pea is a word with a more specific, narrower meaning than garden pea:

Other hyponyms of garden pea include snow pea, sugar snap pea, split-pea.

garden pea (noun)	sugar pea (noun)
fresh pea	green peas with flat edible pods
plant producing peas usually eaten fresh rather than dried	variety of pea plant producing peas having thin flat edible pods
the flattened to cylindric inflated multi-seeded fruit of the common pea plant