Ska = The root word.
Something to do with thieves or theft, relating to thieves or theft.
Ska + az = Skaz
A thief in general. (Note that the extra "a" is dropped).
Ska + i = Ski
Thieves in general (plural).
Ska + az + i = Skazi
A specific thief; "the thief".
Ska + it = Skit
"Steal", the act of theft.
Ska + ak = Skak
The concept of theft.
Ska + ar = Skar
Stealing, in the general sense that people have stolen since the dawn of time and will continue to do so forever.
Ska + en = Sken
Stealing, thievery, a theft which is currently taking place.
Ska + al = Skal
Any specific group of thieves, such as one might see in the slums of Altdorf-- as opposed to a named organisation of thieves.
Ska + ul = Skul (or possibly Skaul, Skhul or Skahul)
The art or mastery of theft; the profession of thievery.
Ska + ha = Ska ha (or possibly Skaha)
"Thief!" Used as an insult, or to indicate that you have just realised you have been stolen from.