Is there a word for something that's between a "job" and a "hobby"?
It's a phenomenon you'll often see among people who don't need to work, but for whatever reason choose to be employed. Their job's characteristics include:
1) Very flexible work hours
2) Low stress
3) Little or no metrics for determining success
4) Little or no involvement of a supervisor/boss
6) Modest pay
The people I see who have these types of "jobs" generally have wealth from some other source (nearing retirement, rich parents, rich spouse, etc). Their financial picture probably wouldn't change significantly if they suddenly quit. So they've got reasons for working that are non-financial.
Whatever you'd call their gig, it'd be inaccurate to call it a "hobby", because it's not enjoyable enough, and it generates a non-trivial (albeit modest) amount of income. Yet given its very undemanding and flexible nature, I think it's unfair to call it a full-fledged job. And there's nothing wrong with these types of "jobs", but it's really frustrating when people start comparing them with real jobs that people have to work because they need an income.