blueweed vs blue devil

blueweed and blue devil both are nouns.

Word	Noun	Adjective	Verb	Adverb
blueweed	Yes	No	No	No
blue devil	Yes	No	No	No

As nouns, blueweed and blue devil are synonyms defined as:

blueweed and blue devil: a coarse prickly European weed with spikes of blue flowers; naturalized in United States

Other synonyms of blueweed include blue thistle, Echium vulgare, viper's bugloss.

blueweed (noun)	blue devil (noun)
a coarse prickly European weed with spikes of blue flowers; naturalized in United States	the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
	a coarse prickly European weed with spikes of blue flowers; naturalized in United States