partisan

nouns

a fervent and even militant proponent of something
drumbeater, partisan, zealot
is derived from
partisanship
antonym
nonpartisan
an ardent and enthusiastic supporter of some person or activity
enthusiast, partisan, partizan
is derived from
partisanship
a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries
partisan, partizan

adjectives

devoted to a cause or party
partisan, partizan
antonym
nonpartisan