spring vetch vs vetchling

spring vetch and vetchling both are nouns.

Word	Noun	Adjective	Verb	Adverb
spring vetch	Yes	No	No	No
vetchling	Yes	No	No	No

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

spring vetch: bushy European perennial having nodding racemose violet-blue flowers
vetchling: any of various small plants of the genus Lathyrus; climb usually by means of tendrils

spring vetch (noun)	vetchling (noun)
herbaceous climbing plant valuable as fodder and for soil-building	any of various small plants of the genus Lathyrus; climb usually by means of tendrils
bushy European perennial having nodding racemose violet-blue flowers