The best replacement for control group is experimental group.

The best alternatives to control group are rated as following:

★★★★★	experimental group
★★★	treatment group
★★★	test group
★★	experimental
★★	comparison group
★★	controlled variable
★	controlled experiment
★	placebo
★	independent variable
★	intervention group
★	control variable
★	variable group
	experiment group
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	study group
	focus group
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	dependent variable
	target group

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Speaking about control group, one probably shouldn't forget about an experiment.

Other search terms related to control group and their ratings are:

★★★★★	an experiment
★★★	pretest and posttest

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control group

experimental group

treatment group