blue bugle vs bugleweed

blue bugle and bugleweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue bugle	Yes	No	No	No
bugleweed	Yes	No	No	No

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

blue bugle: 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 blue bugle include bugle.

blue bugle (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