What is another word for lice?

There isn't really a more common or polite synonym for "lice." It's a fairly specific and straightforward word. However, you might use some less direct terms depending on the context:

* Head bugs: This is a more informal and child-friendly way to refer to head lice.

* Parasites: This is a more scientific term that can be used to describe lice, as they are insects that live on and feed off of other organisms.

* Infestation: This is a more clinical term to describe the presence of lice in the hair or on the body.

It's important to note that these alternatives are not as precise as "lice" and may not be appropriate in all situations.