The difference between Additional and Unnecessary
When used as adjectives, additional means supplemental or added to something, whereas unnecessary means not needed or necessary.
Additional is also noun with the meaning: something added.
check bellow for the other definitions of Additional and Unnecessary
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Additional as an adjective:
Supplemental or added to something.
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Additional as a noun:
Something added.
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Unnecessary as an adjective:
Not needed or necessary.
Examples:
"The automatic child-frightener made clowns unnecessary."
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Unnecessary as an adjective:
Done in addition to requirements; unrequired.