Astragalus danicus vs purple milk vetch

Astragalus danicus and purple milk vetch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Astragalus danicus	Yes	No	No	No
purple milk vetch	Yes	No	No	No

As nouns, Astragalus danicus and purple milk vetch are synonyms defined as:

Astragalus danicus and purple milk vetch: perennial of southern and western Europe having dense racemes of purple or violet flowers

Astragalus danicus (noun)	purple milk vetch (noun)
perennial of southern and western Europe having dense racemes of purple or violet flowers	perennial of southern and western Europe having dense racemes of purple or violet flowers