blueweed vs viper's bugloss

blueweed and viper's bugloss both are nouns.

Word	Noun	Adjective	Verb	Adverb
blueweed	Yes	No	No	No
viper's bugloss	Yes	No	No	No

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

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

Other synonyms of blueweed include blue devil, blue thistle, Echium vulgare.

blueweed (noun)	viper's bugloss (noun)
a coarse prickly European weed with spikes of blue flowers; naturalized in United States	a coarse prickly European weed with spikes of blue flowers; naturalized in United States