1) An advocate of monopoly 2) Hog of a kind 3) Monopoliser 4) Monopolizer 5) Selfish person 1) Hog 2) Mfq 3) Monopoliser 4) Monopolizer 5) Pig 
• (n.) One who monopolizes; one who has a monopoly; one who favors monopoly.
Mo·nop'o·list (mo*nŏp'o*lĭst) noun One who monopolizes; one who has a monopoly; one who favors monopoly. 
[n] - someone who monopolizes the means of producing or selling something
monopole, monopolist Someone who monopolizes or possesses a monopoly; one who favors the practice of monopoly.
monopolizer noun someone who monopolizes the means of producing or selling something
a person who has a monopoly. · an advocate of monopoly.