partisan

noun

1.
a fervent and even militant proponent of something
drumbeater zealot
Antonym:
nonpartisan
Derived from:
partisanship
2.
an ardent and enthusiastic supporter of some person or activity
enthusiast partizan
Derived from:
partisan partisanship
3.
a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries
partizan