Depending on the context it can be several words.To illuminate a manuscript is maisigh le dathanna(decorate with colours).To illuminate a room or a mind is soilsigh; tabhair solas do (give light to).Cur soilse ar .. (To put light on buildings or streets.).Maisigh le dathanna (to decorate with colours, as in a manuscript).Tabhair léargas ar (To give enlightenment on a matter of learning).
It sounds roughly like sul-uss. It means 'light'.
It doesn't look like an Irish word.
In Irish and Scottish Gaelic, solas (noun).
The Irish word for "mason" is "maisín."
The word qaolionn is not Irish. Irish has no "q".
agus
the Irish word for William is Liam
It is ach [okh].
Nervicious? Is that a word?
speur, iarmailt, adharsee Am Faclair Beag for examples of usage.
The Irish word for "eye" is spelt súil.