Some words using double letters would be:
book
letter
squirrel
barrette
majorette
clippers
slippers
flippers
horrible
terrible
gullible
classify
lollipop
occurred
glittery
slippery
possible
porridge
carriage
marriage
corridor
flattery
necessary
trespass
assassin
accident
applause
appliance
commuter
grommet
passport
trapper
propeller
applicant
additive
addition
blizzard
additive
buttered
attention
tattered
passable
collapse
vilified
dribbling
scribble
addicted
effected
affected
affluent
terrific
horrific
addict
arrange
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Some things (nouns) that start with letters A-Z are:angelapplebrushbuttercarcarpetdandeliondinosaureggeraserfarmflapgonggumhairpinhatiglooironjeweljumperkitchenkitelaundrylemonmelonmousenoisenoseoatoperapavementpineapplequartquarterroperosesandwichsirloin steaktelevisiontubukuleleumbrellavestvestibulewagonwristxenonx-rayyakyolkzipperzircon
azure, azimuth
Not many words begin with double letters. A few of those that do start with double letters include aardvark, eel, eerie, llama, ooh, oomph and ooze.