Are there multiple words for "up"
Yes. You use suas, thuas, anuas to refer to something that is above the position of the speaker. e.g.
Chuaigh fear suas go barr cnoic, d'fhan sé thuas ansin tamall, ansin tháinig sé anuas arís.
A man went up to the top of a hill, he stayed up there for a while, then he came down again.
- suas for going upwards
- thuas for being stationary up above
- anuas for coming down from above
The corresponding ones for below are