mustard vs dry mustard

mustard and dry mustard both are nouns.

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

As nouns, dry mustard is a hyponym of mustard; that is, dry mustard is a word with a more specific, narrower meaning than mustard:

mustard: pungent powder or paste prepared from ground mustard seeds
dry mustard: a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic

Other hyponyms of mustard include powdered mustard, Chinese mustard, sarepta mustard.

mustard (noun)	dry mustard (noun)
pungent powder or paste prepared from ground mustard seeds	a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic
leaves eaten as cooked greens
any of several cruciferous plants of the genus Brassica