There are 1170 words like that in the Scrabble dictionary. But your question contains a tautology, so perhaps this is not what you mean. If not, you might reword the question. Here are 100 of the more common ones:
abbey
abbot
abyss
achoo
adder
addle
affix
afoot
agree
Allah
allay
alley
allot
allow
alloy
aloof
amass
amiss
annex
annoy
annul
apple
apply
array
arrow
ASCII
assay
asset
atoll
attar
attic
baggy
balls
banns
batty
beech
beefy
belle
belly
berry
billy
bleed
bleep
bless
bliss
blood
bloom
bluff
bobby
boggy
bonny
booby
boost
booth
booty
booze
bossy
brass
breed
brood
brook
broom
buddy
buggy
bully
bunny
burro
butte
cabby
caddy
canny
carry
catty
cello
chaff
cheek
cheep
cheer
chill
class
cliff
comma
crass
creed
creek
creel
creep
cress
crook
croon
cross
curry
daddy
daffy
dally
ditto
ditty
divvy
dizzy
4 letter words, letters 2 and 3 are the same:allybeetbeenbeefbeepbeerbeesboomboonbootcookcoolcoopdeepdeeddeerdoomdoorfeedfeelfeesfeetfoodfoolfootgoodheelhoodhoofhoophootjeepkeepleerloomloonlooplootmeetmoodmoonseedeggsElla
ponys
array
addseggsoddsAnnebeefbeenbeepbeerbeetbootbookboomboonbooscoolcootdeerdeepdeeddeemdoordoomfeedfeelfeetfoodfoolfootgoodgeedgoofgoongoopheedheelheedhoodhoofhoophootjeepjeerkeepkeelkeenleekleerloonloomlooplootmeetmoodmoonmoormootneednooknoonpeerpoofpeelpoolpeeppeerroofroomrootreedreelseedseemseenseerseessoonteentooltootwoolweedwoodwoofweep
Four_letter_words_that_have_the_same_letter_for_the_first_and_third
American 'meter' = British 'metre'
4 letter words, letters 2 and 3 are the same:allybeetbeenbeefbeepbeerbeesboomboonbootcookcoolcoopdeepdeeddeerdoomdoorfeedfeelfeesfeetfoodfoolfootgoodheelhoodhoofhoophootjeepkeepleerloomloonlooplootmeetmoodmoonseedeggsElla
Some examples of five-letter words that begin and end with the same letter are: radar, level, civic, minim, and kayak.
ponys
array
addseggsoddsAnnebeefbeenbeepbeerbeetbootbookboomboonbooscoolcootdeerdeepdeeddeemdoordoomfeedfeelfeetfoodfoolfootgoodgeedgoofgoongoopheedheelheedhoodhoofhoophootjeepjeerkeepkeelkeenleekleerloonloomlooplootmeetmoodmoonmoormootneednooknoonpeerpoofpeelpoolpeeppeerroofroomrootreedreelseedseemseenseerseessoonteentooltootwoolweedwoodwoofweep
Four_letter_words_that_have_the_same_letter_for_the_first_and_third
Some seven letter words with the first and sixth letters the same are:abysmalaccrualacrobatadmiralalmanacanagramangulararrivalartisanarsenalcapricechalicecollectcompactconcoctconductconnectcontactconvictcorrectcornicecrevicedecidedegradeearlierepithetescapeefalsifyfortifygarbagegeologyhealthyidioticillicitimperilinertiaingraininhabitinheritinhibitinsulininvalidkaraokelegallylegiblylightlylikablelocallylooselylovableloyallyluckilymacramenirvananothingoctagonopinionoutlookovationoxbloodperhapspreceptpreemptrampartrapturerectoryrequirerestorerevelryrivalryrhubarbrupturesadnesssarcasmselfishsoloiststylishsubsistsuccesssucrosesuggestsupposesurmisesurpasssynapsetaffetatermitethirstythriftytributetrinityuraniumwillowy
Titter, Settee
ballooningbottleneckbottomlessbuttercupsbuttonholecellphonescorrelatescorrugatescottontailcorrectioncorruptiondifferencedissimilardissonancehammerheadlitterbugsmissionarypassagewaypatterningsaddlebagssettlementwallpaperssleepwalkssweetheart
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