white lettuce vs cankerweed

white lettuce and cankerweed both are nouns.

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

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

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

Other synonyms of white lettuce include Nabalus alba, Prenanthes alba.

white lettuce (noun)	cankerweed (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