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