alpine milk vetch vs milk vetch

alpine milk vetch and milk vetch both are nouns.

Word	Noun	Adjective	Verb	Adverb
alpine milk vetch	Yes	No	No	No
milk vetch	Yes	No	No	No

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

alpine milk vetch: perennial of mountainous areas of Eurasia and North America
milk vetch: any of various plants of the genus Astragalus

Other hypernyms of alpine milk vetch include milk-vetch.

alpine milk vetch (noun)	milk vetch (noun)
perennial of mountainous areas of Eurasia and North America	any of various plants of the genus Astragalus