dummy vs mannequin

dummy and mannequin both are nouns.

Word	Noun	Adjective	Verb	Adverb
dummy	Yes	Yes	Yes	No
mannequin	Yes	No	No	No

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

Other hyponyms of dummy include lay figure, form, manakin, manikin, mannikin, ventriloquist's dummy.

dummy (noun)	mannequin (noun)
a figure representing the human form	a life-size dummy used to display clothes
a cartridge containing an explosive charge but no bullet	a woman who wears clothes to display fashions
an ignorant or foolish person
a person who does not talk

dummy (adjective)	mannequin (adjective)
having the appearance of being real but lacking capacity to function

dummy (verb)	mannequin (verb)
make a dummy of