wild winterpea vs wild pea

wild winterpea and wild pea both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild winterpea	Yes	No	No	No
wild pea	Yes	No	No	No

As nouns, wild pea is a hypernym of wild winterpea; that is, wild pea is a word with a broader meaning than wild winterpea:

wild winterpea: a weak-stemmed winter annual native to Mediterranean region for long established in southern United States; cultivated as a cover and pasture crop
wild pea: any of various plants of the family Leguminosae that usually grow like vines

wild winterpea (noun)	wild pea (noun)
a weak-stemmed winter annual native to Mediterranean region for long established in southern United States; cultivated as a cover and pasture crop	any of various plants of the family Leguminosae that usually grow like vines