Dracocephalum parviflorum vs dragon's head

Dracocephalum parviflorum and dragon's head both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dracocephalum parviflorum	Yes	No	No	No
dragon's head	Yes	No	No	No

As nouns, Dracocephalum parviflorum and dragon's head are synonyms defined as:

Dracocephalum parviflorum and dragon's head: American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers

Other synonyms of Dracocephalum parviflorum include dragonhead.

Dracocephalum parviflorum (noun)	dragon's head (noun)
American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers	American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers