Gaelic (Irish and Scottish)
* Irish: *gáire* (pronounced GOW-ruh)
* Scottish Gaelic: *gàire* (pronounced GAH-ruh)
Welsh
* Welsh: *chwerthin* (pronounced KHER-thin) - This literally means "laugh," but can also be used to mean "smile."
Breton
* Breton: *klev* (pronounced KLAV)
Other Celtic Languages
* Manx: *gairy* (pronounced GAR-ee)
* Cornish: *gwel* (pronounced GWEL)
It's important to remember that these are just examples, and there might be other ways to express "smile" in these languages.
It's also worth noting that some of these words might carry different connotations than the English word "smile." For example, in Irish, *gáire* can be used to describe a broader range of facial expressions, including laughter and joy.