Here is a list of the 31 new 3 letter words that have been added in CSW15 featured in WESPA's Collins Scrabble Words 2015 initiation kit, which is a must read for Scrabble players across the globe.

The first set of 33 new 4 letter words added can be found here. The second set of 33 new 4 letter words added can be found here. The last set of 33 new four letter words are available here.
Word 
 | 
Meaning 
 | 
Word 
 | 
Meaning 
 | 
AJI 
 | 
a spicy pepper 
 | 
PAK 
 | 
a pack 
 | 
CAF 
 | 
a cafeteria or cafe 
 | 
PWN 
 | 
to dominate or humiliate an opponent esp in online gaming 
 | 
CAL 
 | 
calorie 
 | 
RYU 
 | 
a school of martial arts 
 | 
DEP 
 | 
a convenience store 
 | 
SEV 
 | 
an Indian food of deep-fried strands of flour 
 | 
DUM 
 | 
cooked with steam 
 | 
SHO 
 | 
a nonstandard spelling of sure 
 | 
EEW 
 | 
an interjection used to express disgust 
 | 
SIG 
 | 
a signature 
 | 
FOO 
 | 
a name for a temporary computer variable or file 
 | 
TIZ 
 | 
a state of confusion 
 | 
GRR 
 | 
an interjection used to express anger or annoyance 
 | 
VOG 
 | 
air pollution caused by volcanic dust 
 | 
LUN 
 | 
a lee 
 | 
VOM 
 | 
to vomit 
 | 
MMM 
 | 
an interjection expressing agreement or enjoyment 
 | 
WAZ 
 | 
to urinate 
 | 
NAV 
 | 
navigation 
 | 
WUZ 
 | 
a nonstandard spelling of was 
 | 
NUG 
 | 
a chunk of wood sawn from a log 
 | 
XED 
 | 
X, to delete 
 | 
NYM 
 | 
a dispute about the right to publish material on the Internet 
under a fictitious name 
 | 
YAS 
 | 
an Asian pear 
 | 
OMA 
 | 
a grandmother 
 | 
YER 
 | 
your 
 | 
OPA 
 | 
a grandfather 
 | 
YEZ 
 | 
yes 
 | 
ORG 
 | 
an organization 
 | 
New 3 letter words added in CSW 15
http://t.co/xpMI2RQpux pic.twitter.com/PTRV8cYRg6
— samuelR (@RajveerRawlin) September 5, 2015