Which term best describes a regular activity, particularly related to a person's employment or job?

The term "occupation" best describes a regular activity relating to a person's employment or job because it encompasses the types of work or roles individuals engage in within the workforce. An occupation refers specifically to the kind of job or employment a person has, focusing on the tasks performed and the functions carried out in that role.

Occupation is a general term that does not imply any specific level of training or education, making it distinct from "profession," which typically requires specialized education and training. "Trade" refers more to specific skilled jobs often involving manual labor, while "career" denotes a broader, long-term professional journey that might encompass multiple occupations over a person's life. Thus, occupation directly captures the essence of regular work activities related to employment.