This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that makes, trims, designs, or sells hats.

n. A person who is involved in the manufacture, design, or sale of hats for women.

n. Formerly, a man who imported and dealt in small articles of a miscellaneous kind, especially such as please the fancy of women.

n. A person who designs, makes, trims, or deals in hats, bonnets, headdresses, etc., for women.

n. Formerly, a man who dealt in articles for women's wear; according to Johnson, “one who sells ribands and dresses for women”; now, in common usage, a woman who makes and sells bonnets and other head-gear for women; also, in England, one who furnishes both bonnets and dresses, or complete outfits.

n. Formerly, one who made or sold armor of Milan; hence, a dealer in armor.

n. someone who makes and sells hats

""The term milliner covered a wide variety of skills, including making cloaks, muffs, hoops, gloves, riding habits and petticoats" Miriam Moss, Women and Business (London: Wayland"

merchant    maker    shaper    merchandiser   

milliner's fold    milliner's needle   

modiste    hatter   

jeweller    hairdresser    dressmaker    silversmith    mercer    shoemaker    seamstress    tailor    bootmaker    bookseller