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Well the word itself is a combination of Metamorphosis and Magus (which loosely means Wizard). The PH has an F sound. Sound it out..
me-ta-morf-ma-gus
The possessive form for the proper noun Gus is Gus's.
Example: We're invited to Gus's backyard barbecue.
The plural form of Gus is Gus's.
Gus Hansen goes by Gattling Gus, The Poker Tramp, Gamblin' Gus, Mad Gus, and The Great Dane.
Gus Lewis goes by Gus.