mustard vs Indian mustard

mustard and Indian mustard both are nouns.

Word	Noun	Adjective	Verb	Adverb
mustard	Yes	No	No	No
Indian mustard	Yes	No	No	No

As nouns, mustard and Indian mustard are synonyms defined as:

Other synonyms of mustard include leaf mustard, mustard greens.

mustard (noun)	Indian mustard (noun)
pungent powder or paste prepared from ground mustard seeds	leaves eaten as cooked greens
leaves eaten as cooked greens
any of several cruciferous plants of the genus Brassica