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

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n. Agent noun of possess; one who possesses.

n. One who possesses; one who occupies, holds, owns, or controls; one who has actual participation or enjoyment, generally of that which is desirable; a proprietor.

n. One who possesses; one who has or enjoys anything; one who owns; one who holds, occupies, or controls any species of property, real or personal.

n. a person who owns something

"Because the man is here represented as the _possessor_, and _dog_, the _property_, or _thing possessed_; and the genius of our language requires, that when we add to the possessor, the _thing_ which he is represented as possessing, the possessor shall take a particular form to show its _case_, or _relation to the property_; thus, The _man's_ dog eats, _his_ dog eats."

person    mortal    individual    someone    soul    somebody   

naked possessor    bona-fide possessor   

part-owner    holder    homeowner    shipowner    saver    householder   

holder    owner    proprietor    master    occupant    haver    bearer   

Prof.    aggressor    assessor    compressor    dresser    guesser    lesser    lessor    messer    oppressor   

inheritor    possession    occupant    proprietor    purchaser    heir    acquisition    heiress    ownership    guardian