[stylist] using borrowed words?

[helene ryles]

I'm wondering what the rules are on using words that another writer
has made up.

The word I have in mind is squib. For those who haven't read harry
Potter a squib is someone who comes from a magical family but is not
magical themselves. I have a few 'squibs' in a deafblind girl.

Would I be able to use this word in my novel or would I have to make
up another?

Helene