black pea vs vetchling

black pea and vetchling both are nouns.

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

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

black pea: perennial of Europe and North Africa; foliage turns black in drying
vetchling: any of various small plants of the genus Lathyrus; climb usually by means of tendrils

black pea (noun)	vetchling (noun)
perennial of Europe and North Africa; foliage turns black in drying	any of various small plants of the genus Lathyrus; climb usually by means of tendrils