power
powerfulness
efficaciousness
efficacy
incisiveness
trenchancy
effect
effective
effectiveness
effector
effectual
effectuate
efficacious
efficacity
efficiency
efficient
abracadabra
agreed-upon
as-yet-unspecified
beholding
blood-thirstiness
bloomer
briefness
enthymeme
hotchpotch
ineptness
inveteracy
koshkitko
lenience
malignance
mosh
radiometric
turn-on
upto