sweet scabious vs scabiosa

sweet scabious and scabiosa both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet scabious	Yes	No	No	No
scabiosa	Yes	No	No	No

As nouns, scabiosa is a hypernym of sweet scabious; that is, scabiosa is a word with a broader meaning than sweet scabious:

sweet scabious: Old World annual having fragrant purple to deep crimson flower heads; naturalized in United States
scabiosa: any of various plants of the genus Scabiosa

Other hypernyms of sweet scabious include scabious.

sweet scabious (noun)	scabiosa (noun)
Old World annual having fragrant purple to deep crimson flower heads; naturalized in United States	any of various plants of the genus Scabiosa