dummy vs mannikin

dummy and mannikin both are nouns.

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

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

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

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

dummy (verb)	mannikin (verb)
make a dummy of