A reward in recognition from someone else is called a "commendation" or "recognition award." This acknowledgment can take various forms, such as certificates, trophies, or verbal praise, and serves to validate an individual's efforts and achievements. It often enhances motivation and reinforces positive behavior within a community or organization.
When you sell someone else's product, it is called "reselling" or "retailing."
Someone who picks on someone else is called a bully. They are not nice people.
When someone else writes about someone who is deceased, it is called a biography.
Envious.
Copying someone else's work without permission is called plagiarism.
AutoBiography
• Someone who interferes in someone else's life is called a 'meddler.' Obviously.....
a babysitter
Tenant
imposter
A 'Player' can also be called a cheater
jealousy :)