Working in general is simply doing a specified thing in a particular field or platform, according to a defined source it can also be as activity involving mental or physical effort done in order to achieve a result, it does not neccessary involve skilled effort.
To every job occupation, there is a specification and a purpose of that work, it is no different here
occupation indeed is seen as a form of work and it is specified. It is a neccessity for all God's faithful to have a specific work in the vane yard of God for there is saying; if one works in God's vane yard, one would have God work on one's vane yard. nice one @thejotographer 👍