field mustard vs chadlock

field mustard and chadlock both are nouns.

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

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

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

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

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