viper's bugloss vs blue devil

viper's bugloss and blue devil both are nouns.

Word	Noun	Adjective	Verb	Adverb
viper's bugloss	Yes	No	No	No
blue devil	Yes	No	No	No

As nouns, viper's bugloss and blue devil are synonyms defined as:

viper's bugloss and blue devil: a coarse prickly European weed with spikes of blue flowers; naturalized in United States

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

viper's bugloss (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