noun: capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
Length: 15 letters
Scrabble value: 25
Words with Friends value: 29
Literati value: 19
TWL (USA): Found
SOWPODS (UK): Found
efficaciousness
efficacious
succession
accession
caffeinic
cocainise
coiffeuse
sauciness
secession
affusion
caffeine
cosiness
easiness
effusion
issuance
safeness
scission
acinose
acinous
ascesis
caffein
caisson
caseous
cassino
cassius
cession
ciconia
cnossus
cocaine
concise
concuss
conessi
confess
confuse
cuisine
faience
fiancee
finesse
fission
iciness
nicosia
oceanic
oceanus
offence
offense
oniscus
oscines
sanious
science
scincus
senecio
session
socinus
suasion
success
suffice
access
accuse
acinic
acinos
acinus
affine
aussie
casein
casino
cassie
census
cnicus
cocain
coffea
coffee
coffin
coiffe
cosine
cousin
cuisse
ecesis
efface
effuse
encase
enesco
enosis
faeces
fasces
fauces
fenusa
fescue
fiance
fiasco
fusain
fusion
iconic
incase
incise
infuse
ionise
nessie
noesis
office
oscine
sanies
scenic
sconce
scouse
seance
season
seneca
siouan
sonsie
sousse
succos
suisse
susian
uncase
unease
unesco
unicef
unsafe
usance
anise
ascii
ascus
canis
canoe
cause
cease
cense
cisco
cocus
conic
cosec
cusco
ensis
ensue
eosin
essen
feces
fence
fesse
ficus
finis
focus
fossa
fosse
fusee
ianfu
icaco
incus
ionia
ionic
issue
issus
niece
nisei
nisus
noise
oasis
ocean
oscan
ounce
sacco
saone
sauce
scene
scion
scoff
scone
scuff
seine
sense
sinai
sinus
sison
sissu
snafu
sniff
snuff
sofia
sonic
sousa
souse
usnea
acne
aeon
anus
asin
asio
cafe
caff
cain
cane
case
ciao
cisc
coca
coif
coin
cone
coss
coue
csis
cuff
cuon
cuss
ease
esau
face
fain
faun
fess
fica
fice
fief
fife
fifo
fine
fisa
fisc
fuse
fuss
icao
icon
inca
info
isis
naif
ness
nice
nicu
niff
nisi
nose
nous
once
onus
ouse
safe
sane
sass
scan
scsi
sene
sens
sess
sian
sine
sion
sise
siss
sofa
sone
sufi
susa
unai
unco
unio
usaf
usss
acc
ace
aec
ain
ane
ani
ano
ans
anu
ass
auc
can
ceo
cfc
cfo
cia
cio
cis
cns
con
cos
cse
cue
eas
ecc
ecf
eec
eff
ene
eon
eos
ese
fae
fan
fao
fas
fcc
fcs
fee
fen
fes
fin
foe
fun
icc
ice
icu
ifc
iis
inc
ins
ion
iou
isi
isn
nac
nec
nee
neo
noc
nsa
nsc
nsf
nsu
oaf
oas
oca
off
ois
one
oni
sac
sas
sea
sec
see
sen
sic
sif
sin
sis
son
sos
sou
ssa
sse
sss
sue
sun
sus
uca
ufa
ufo
usa
use
usn
ac
ai
an
as
au
ca
cc
ce
cf
ci
co
cs
cu
ea
ec
ee
en
es
eu
fa
fe
fo
ia
ic
ie
ii
in
io
na
nc
ne
ni
no
nu
on
os
sa
sc
se
si
sn
so
ss
un
us
a
c
e
f
i
n
o
s
u
effervescent
effervescing
effete
efficaciously
efficacy
efficiency
efficient
efficiently
effigy