charlock vs wild mustard

charlock and wild mustard both are nouns.

Word	Noun	Adjective	Verb	Adverb
charlock	Yes	No	No	No
wild mustard	Yes	No	No	No

As nouns, charlock and wild mustard are synonyms defined as:

charlock and wild mustard: weedy Eurasian plant often a pest in grain fields

Other synonyms of charlock include Brassica kaber, chadlock, field mustard, Sinapis arvensis.

charlock (noun)	wild mustard (noun)
weedy Eurasian plant often a pest in grain fields	weedy Eurasian plant often a pest in grain fields