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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
noun something which exactly resembles another

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun mirror image

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun something exactly like another

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun opposite

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun family likeness
noun resemblance

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun family relation
noun parallel

Antonyms

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun parallel
LIES! These Words Don't Mean What You Think