Some words that start with the prefix counter:
counteract. counteraction. counteractive. counterargument.
counterattack. counterattraction. counterbalance. counterblast.
counterblow. counterbombardment. counterbore. counterchallenge.
counterchange. countercharge. countercheck. counterclaim.
counterclockwise. countercoup. counterculture. countercurrent.
counterdemonstration. counterespionage. counterexample.
counterfactual. counterfeit. counterfire. counterfoil. counterglow.
counterinsurgency. counterintelligence. counterintuitive.
counterirritant. counterman. countermarch. countermeasure.
countermine. countermove. counteroffensive. counteroffer.
counterpane. counterpart. counterperson. counterplan. counterplay.
counterplea. counterplot. counterpoint. counterpoise.
counterpoison. counterpose. counterproductive. counterproposal.
counterpunch. counterreformation. counterrevolution. countershot.
countersign. countersink. counterspy. counterstain. counterstrike.
countersubversion. countersuit. countertenor. counterterror.
countertop. countertransference. countervail. counterweight.
counterwoman.