Tua and pua are two special affixes that can be attached to all sorts of things.
Pua functions the same way -able does in English.
Atasa timi ya vutipua lo emodohaa po vato amuhe.
Cups low and reachable to everyone inside room food.
The cups are low and reachable to everyone in the cafeteria.
Tua means to cause or make something. So the word for blue, lanu, can become lanutua and mean 'to make blue'. Tua can also be used to create stylistic differences. This example is a bit morbid, but kill means to cause death. The words for kill and die are zopo and zato respectively. But you could just as easily say zatotua, and it would mean the same thing as zopo.