SYN: Substitute, change, vary, modify, exchange, diversify, remodel.
ANT: Retain, perpetuate, conserve, stereotype, arrest, solidify, stabilitate.
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KEY: Alterable.
SYN: Variable, mutable, changeable, movable, revocable.
ANT: Invariable, immutable, fixed, unchangeable, permanent, perpetual, unalterable, immovable.
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KEY: Alteration.
SYN: Variation, difference, diversification, shifting, modification, change, permutation, mutation, mutability.
ANT: Retention, perpetuation, conservation, changelessness, identity, stabilisation, fixity, permanence.