I can think of one: NOON. It is spelled the same way forwards and backwards. If it is capital, it is also spelled the same way upside down.
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Some longer than average words that start and end with the same letter are:straightforwardnessexperiencemilitarismmulticulturalismexterminatesuperfluousnesscatastrophicarachnophobiacharacteristicdecaffeinateddisenfranchisedexcommunicategrandstandinggroundbreakinglackadaisicalnationalizationnewspaperwomanproprietorshipspontaneousnesstranscendentalisttranscriptionist
When most of the words in a sentence start with the same letter, it is called alliteration.
Four letter words with the same first and last letter are:areaariaaquaaurabarbblabblobbulbchicdeaddeeddieddyedeaseeaveedgeelsefiefganggonggroghashhighhushkickkooklolllullmaimneonnoonnounoleoontoOreoorzoouzopeeppimpploppomppoopprepproppulppumprearroarsanssasssoustacttartteattauttenttesttextthattilttintToottorttouttrottufttwitwhew
redderarmadacosmicdemanddeniedgazinggapinggaminglethalrenterrockerstatustalentwillowyearly
Four_letter_words_that_have_the_same_letter_for_the_first_and_third
addseggsoddsAnnebeefbeenbeepbeerbeetbootbookboomboonbooscoolcootdeerdeepdeeddeemdoordoomfeedfeelfeetfoodfoolfootgoodgeedgoofgoongoopheedheelheedhoodhoofhoophootjeepjeerkeepkeelkeenleekleerloonloomlooplootmeetmoodmoonmoormootneednooknoonpeerpoofpeelpoolpeeppeerroofroomrootreedreelseedseemseenseerseessoonteentooltootwoolweedwoodwoofweep
Aardvark, beekeeper, and bookkeeper are other examples of words that start with the same letter twice.
Alliteration is when words that follow each other start with the same letter. E.G: crazy car, bouncy bunny...
One example of a four-letter word where the second and last letters are the same is "ball." In this word, the second letter 'a' is the same as the last letter 'l.' Another example is "hall," where the second letter 'a' is also the same as the last letter 'l.' These are known as palindromic words, where the word reads the same forwards and backwards.
areablabdeedkickkooknounsaysdeadhighhaththatbombtiltpumpsitsnon(french)pulppropfluffhushGrogbobb