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 stirs up trouble or strife.

n. One who causes trouble, especially one who does so deliberately.

n. A complainer.

n. someone who deliberately stirs up trouble

"The conductor/pianist/Olympic-class troublemaker is also promoting his new memoir, Music Quickens Time (at least that's the American title, anyway)."

persona non grata    unwelcome person   

rioter    practical joker    provoker    instigator    hellion    instigant    agitator    hellhound    heckler    firebrand   

complainer    stirrer    hooligan   

faker    to-day    mutineer    blackmailer    coxcombs    seedship    rednecks    sympathizer    aggressor    dissident