283 words in the 6th but not in earlier versions of the 5th Edition Official Scrabble Players Dictionary. Compiled by Chris Ulicky & Jack Feller, August 2019 - February 2020
If you can add to this list, please send your additions to artchester@sbcglobal.net. Many thanks!

agyria
agyrias
airball
airballed
airballing
airballs
ajies
ampacities
ampacity
anagen
anagens
ansatz
ansatzes
antifa
antifas
aquafaba
arahuana
arahuanas
arancini
arawana
arawanas
arowana
arowanas
aruana
aruanas
asiago
asiagos
audism
audisms
audist
audists
autosave
autosaved
autosaves
autosaving
babesiae
barcode
barcodes
basehead
baseheads
beatdown
beatdowns
bestie
besties
bibimbap
bibimbaps
bitcoin
bitcoins
bitrate
bitrates
biturbo
biturbos
bizjet
bizjets
blacktip
blacktips
blewit
bloggier
bloggiest
bloggy
bokeh
bokehs
botnet
botnets
buildout
buildouts
cankle
cankles
capcom
capcoms
capiche
capish
captcha
captchas
catagen
catagens
caveola
caveolae
caveolar
chhertum
chyron
chyrons
cocurate
cocurated
cocurates
cocurating
coinvest
coinvested
coinvesting
coinvests
conlang
conlangs
cotija
dholl
dholls
didymo
didymos
disodium
dropdown
dropdowns
eeling
emoji
emojis
eustress
eustresses
ew
exome
exomes
exoneree
exonerees
exuvia
exuvium
facepalm
facepalmed
facepalming
facepalms
farro
farros
feninga
fibrate
fibrates
flatbrod
flatbrods
froideur
froideurs
frownier
frowniest
frowny
gamified
gamifies
gamify
gamifying
gean
geans
gipsyish
gipsyism
gipsyisms
graphene
graphenes
grizzes
hivemind
hiveminds
hmmm
imipenem
imipenems
internet
internets
judgey
judgier
judgiest
judgy
kopiyky
kopiyok
leucism
leucisms
listicle
listicles
longform
loogie
loogies
lor
macaron
macarons
mes
metica
meticas
misfold
misfolded
misfolding
misfolds
mulloway
mulloways
nonavian
noni
nonis
nonkin
nonkins
nubber
nubbers
nutjob
nutjobs
ok
onboarded
onboarding
onboards
othered
othering
owie
owies
papasan
papasans
platanna
platannas
pregamed
pregaming
puggle
puggles
qapik
qapiks
quorate
ragdoll
ragdolls
reais
relisten
relistened
relistening
relistens
rootkit
rootkits
rotely
santoku
santokus
schneid
schneids
seroma
seromas
sheeple
sheeples
sho
sputums
sriracha
srirachas
substorm
substorms
tallitot
telogen
telogens
terefa
theanine
theanines
thetri
thetris
togrog
togrogs
truther
truthers
twerk
twerked
twerking
twerks
uncloned
uncomelier
uncomeliest
unfondly
unfussed
unglitzy
unsaw
unsee
unsees
unsexily
unshowier
unshowiest
untrendier
untrendiest
unusably
upcycle
upcycled
upcycles
upcycling
vape
vaped
vaper
vapers
vapes
vaping
visibles
walie
wayback
waybacks
whirra
woker
wokest
wordie
wordies
wuddies
wuddy
yowza
yuke
yuked
yukes
yuking
zen
zomboid