Ajuga genevensis vs bugleweed

Ajuga genevensis and bugleweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ajuga genevensis	Yes	No	No	No
bugleweed	Yes	No	No	No

As nouns, bugleweed is a hypernym of Ajuga genevensis; that is, bugleweed is a word with a broader meaning than Ajuga genevensis:

Ajuga genevensis: upright rhizomatous perennial with bright blue flowers; southern Europe
bugleweed: any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover

Other hypernyms of Ajuga genevensis include bugle.

Ajuga genevensis (noun)	bugleweed (noun)
upright rhizomatous perennial with bright blue flowers; southern Europe	any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover
	a mildly narcotic and astringent aromatic herb having small whitish flowers; eastern United States