charlock vs field mustard

charlock and field mustard both are nouns.

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

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

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

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

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