Career (noun) - An occupation undertaken for a significant period of a person’s life and with opportunities for progress.
Synonyms: Profession, Occupation, Vocation, Job, Employment.
Example: Joni Mitchell is a famous singer who also has a separate career as a painter.
Carrier (noun) - A person or thing that carries, holds, or conveys something.
Synonyms: Bearer, conveyor, transporter.
Example: Impure drinking water can be a carrier of diseases.