This is a consolidation of my posts from the Spelling Discrepancies thead.

"alazhi" not "alzahi" or "alayhi"
"Commander Bacara"
"Barriss Offee"
"BlasTech"
"B'omarr monks"
"Boushh"
"Bogden" not "Bodgen"
"Chandrila" not "Chandrilla"
"Dack" not "Dak"
"Darth Plagueis"
"Doda Bodonawieedo" not "Dodo Bondonawieedo""
"dreadnaught" not "dreadnought" (preferred Star Warsy spelling)
"Dressellian" not "Dresselian"
"Dufilvian/Filvian" not "Duflivian/Flivian"
"elba beer/water" not "ebla"
"gaderffii stick"
"Gamorrean"
"General Grievous"
"Micah Giiett" not "Giett"
"hibridium" not "hybridium"
"Iktotchi"
"InterGalactic Banking Clan"
"Jamillia" not "Jamilla"
"japor snippet"
"Joh Yowza" not "Yowzah"
"Talon Karrde"
"Kashyyyk"
"Klatooinian" not "Klatooinan"
"Klivian" not "Klivan"
"midi-chlorians"
"Millennium Falcon"
"Muunilinst"
"Nar Shaddaa"
"Nejaa and Keiran Halcyon" not "Neeja and Kieran Halycon"
"Neimoidian"
"Nien Nunb" (Ten Numb is different character)
"Padmé Amidala" (don't forget the accent)
"Podracer" (one word, capitalized)
"Quelii sector" not "Quelli"
"Gilad Pellaeon"
"Ralltiir"
"sabacc" not "sabaac"
"Saesee Tiin"
"Sarlacc" not "Sarlaac"
"Sienar" not "Seinar"
"Sifo-Dyas"
"Silviut Corporation"
"Slave I" not "Slave 1"
"SoroSuub"
"stygium" not "stygian"
"Taanab" not "Tanaab"
"Tatooine"
"Tholoth headdress" not "Toloth"
"Toonbuck Toora" not "Tonbuck" or "Toonebuck"
"Thrackan Sal-Solo" not "Thracken"
"Tosche" not "Toshi"
"Tydirium"
"Tyranus" not "Tyrannus"
"Vilmarh Grahrk"
"Zam Wesell" not "Wessel"
"Wilhuff Tarkin" not "Willhuff"
"Wookiee" not "Wookie"
"Yavin 4" not "Yavin IV" ("Yavin Four" is used when written as dialogue)
"Yuuzhan Vong"
"Zonama Sekot" not "Zonoma"