mannequin vs manikin

mannequin and manikin both are nouns.

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

As nouns, mannequin and manikin are synonyms defined as:

Other synonyms of mannequin include form, manakin, mannikin.

As nouns, mannequin and manikin are synonyms defined as:

Other synonyms of mannequin include fashion model, manakin, mannikin, model.

mannequin (noun)	manikin (noun)
a life-size dummy used to display clothes	a life-size dummy used to display clothes
a woman who wears clothes to display fashions	a person who is very small but who is not otherwise deformed or abnormal
	a woman who wears clothes to display fashions