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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.
verb verbally recognize receipt of something

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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verb write explanatory notes

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

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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verb see, recognize

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

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

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun group of words; way of speaking

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

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