The difference between Nobody and Someone
When used as nouns, nobody means someone who is not important or well-known, whereas someone means a partially specified but unnamed person.
When used as pronouns, nobody means not any person, whereas someone means some person.
check bellow for the other definitions of Nobody and Someone
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Nobody as a pronoun:
Not any person; the logical negation of somebody.
Examples:
"I asked several people, but nobody knew how."
"Nobody called or visited that day."
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Nobody as a noun:
Someone who is not important or well-known.
Examples:
"Whether you're a nobody or a player, everyone in Tinseltown wants to be King of Hollywood!'' - [http://www.conqueringhollywood.com/ Conquering Hollywood]"
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Someone as a pronoun:
Some person.
Examples:
"Can someone help me, please?"
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Someone as a noun:
A partially specified but unnamed person.
Examples:
"Do you need a gift for that special someone?"
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Someone as a noun:
an important person
Examples:
"He thinks he has become someone."