common sage vs salvia

common sage and salvia both are nouns.

Word	Noun	Adjective	Verb	Adverb
common sage	Yes	No	No	No
salvia	Yes	No	No	No

As nouns, salvia is a hypernym of common sage; that is, salvia is a word with a broader meaning than common sage:

common sage: shrubby plant with aromatic greyish-green leaves used as a cooking herb
salvia: any of various plants of the genus Salvia; a cosmopolitan herb

Other hypernyms of common sage include sage.

common sage (noun)	salvia (noun)
shrubby plant with aromatic greyish-green leaves used as a cooking herb	any of various plants of the genus Salvia; a cosmopolitan herb