Someone vs. Everyone

Some person.

Example: ‘Can someone help me, please?’;

A partially specified but unnamed person.

Example: ‘Do you need a gift for that special someone?’;

an important person

Example: ‘He thinks he has become someone.’;

a human being;

Example: ‘there was too much for one person to do’;

an unknown or unspecified person; some person

Example: ‘someone from the audience shouted out’; ‘there's someone at the door’;

a person of importance or authority

Example: ‘a small-time lawyer keen to be someone’;

Every person.

Everybody; - commonly separated, every one.