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Alter (which can be alter ego, alternate, etc.)

Aqua (which can be aquatic, aquarium, aqueduct)

Bio- (which can be biography, autobiography, antibiotic, biolog.y)

Demo (which can be democracy, epidemic, demography)

A root word is just a word that has prefixes added to it to make another word, such as the examples that I listed.

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14y ago

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