Trying to compose a strict Breen A-Z based on basic info plus the world's of David Mack:
A- Aventine (NCC 82602), Amoniri
B- Breen
C- CRM-114, Cloaking Device
D- Dominion
E- Ezri Dax
F- Fenrisal
G- Form
H- Halomatrix
I- Integrator (Chronotron)
J- Jem'Hadar, Julian Bashir, Jaunt Ship
K- Klingon
L- ?
M- Mirror Universe
N- Neural truncheon
O- Omega
P- Paclu
Q- ?
R- Refrigeration Suit
S- Spetskar, Sarina Douglas, Section 31, Slipstream Drive, Silwaam
T- Typhon Pact, Third Phase Disruptor
U- ?
V- Vironat, Vesta-Class, Vocoder
W- Wormhole Drive
X- ?
Y- ?
Z- ?
Spellchecker messed up Gorn and Silwaan...