grass pea vs vetchling

grass pea and vetchling both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass pea	Yes	No	No	No
vetchling	Yes	No	No	No

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

grass pea: European annual grown for forage; seeds used for food in India and for stock elsewhere
vetchling: any of various small plants of the genus Lathyrus; climb usually by means of tendrils

grass pea (noun)	vetchling (noun)
European annual grown for forage; seeds used for food in India and for stock elsewhere	any of various small plants of the genus Lathyrus; climb usually by means of tendrils