dummy vs manikin

dummy and manikin both are nouns.

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

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

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

dummy (noun)	manikin (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 person who is very small but who is not otherwise deformed or abnormal
an ignorant or foolish person	a woman who wears clothes to display fashions
a person who does not talk

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

dummy (verb)	manikin (verb)
make a dummy of