vomitive vs dry mustard

vomitive and dry mustard both are nouns.

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

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

vomitive: a medicine that induces nausea and vomiting
dry mustard: a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic

Other hyponyms of vomitive include ipecac, powdered mustard.

vomitive (noun)	dry mustard (noun)
a medicine that induces nausea and vomiting	a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic