cankerweed vs white lettuce

cankerweed and white lettuce both are nouns.

Word	Noun	Adjective	Verb	Adverb
cankerweed	Yes	No	No	No
white lettuce	Yes	No	No	No

As nouns, cankerweed and white lettuce are synonyms defined as:

cankerweed and white lettuce: herb of northeastern North America having drooping clusters of yellowish-white flowers; sometimes placed in genus Prenanthes

Other synonyms of cankerweed include Nabalus alba, Prenanthes alba.

cankerweed (noun)	white lettuce (noun)
herb of northeastern North America having drooping clusters of yellowish-white flowers; sometimes placed in genus Prenanthes	herb of northeastern North America having drooping clusters of yellowish-white flowers; sometimes placed in genus Prenanthes