One who is politically active in the role of a citizen; especially, one who campaigns for change.
One who is conspicuously active in carrying out any occupational or professional functions.
Behaving as an activist.
A person who likes or tends to express a contradicting viewpoint, especially one who denounces the majority persuasion.
A financial investor who tends to have an opinion of market trends at variance with most others.
Pertaining to or characteristic of a contrarian.