Formal:
* Remote work
* Telecommuting
* Work from home (WFH)
* Virtual work
* Home-based employment
Informal:
* Working remotely
* Being a digital nomad
* Freelancing
* Gig work
* Being self-employed
Specific to certain types of work:
* Online teaching
* Virtual assistant
* Content creator
* E-commerce entrepreneur
* Software developer
The best word to use will depend on the context. For example, if you're writing a formal business document, "remote work" would be a good choice. But if you're talking to a friend about your work, you might say "I work from home."