What is another word for tupperware?

There isn't really a perfect synonym for "Tupperware" since it's a brand name, but here are some options depending on what you want to emphasize:

General terms:

* Food container

* Storage container

* Plastic container

* Lunch box (if it's for packing food)

More specific terms:

* Lock & Lock (another popular brand)

* Rubbermaid (another popular brand)

* Crock-Pot (for slow cookers)

* Mason jars (glass containers with lids)

Ultimately, the best word depends on the context and what you want to convey.