One who opposes a specific ship or shipping in general.
One who objects to ships or shipping deemed offensive, e.g. due to incest, age differences, abusive elements, or power gaps (treating the other partner badly because they have less authority).
One who is opposed or objects (to a policy, course of action or set of ideas).
The participant who opens an academic debate by putting forward objections to a theological or philosophical thesis.
One who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.
One who opposes another in words (in a dispute, argument or controversy).
One who opposes another physically (in a fight, sport, game, or competition).