againster
noun
against·er
əˈgen(t)-stər
-ˈgin(t)-,
-ˈgān(t)-
plural againsters
informal
: a person who frequently or habitually expresses opposition to the ideas or policies of others
Gerry Ford has always been an "againster." That was the duty of the Republican leadership in the House—never to propose, always to oppose.—Thomas P. "Tip" O'Neill, quoted in The (Dubuque, Iowa) Telegraph Herald, 11 Jan. 1976
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Merriam-Webster unabridged
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