Oh, dude, you're talking about words like "happy" and "kitty." Isn't that like super fascinating? I mean, who knew words could have the same letters at the end and still make sense, right? So, yeah, those are some examples for ya.
addallassbeeboocooebbeggerrfeegeeillinnleeloomoooddoffpeeseeteetoozoo
see, pee bee, poo, loo, boo
addallAnnassbeeboocoofeegeegooillinnerrneeoddoffseetee
4 letter words, letters 2 and 3 are the same:allybeetbeenbeefbeepbeerbeesboomboonbootcookcoolcoopdeepdeeddeerdoomdoorfeedfeelfeesfeetfoodfoolfootgoodheelhoodhoofhoophootjeepkeepleerloomloonlooplootmeetmoodmoonseedeggsElla
Four letter words with the same first and last letter are:areaariaaquaaurabarbblabblobbulbchicdeaddeeddieddyedeaseeaveedgeelsefiefganggonggroghashhighhushkickkooklolllullmaimneonnoonnounoleoontoOreoorzoouzopeeppimpploppomppoopprepproppulppumprearroarsanssasssoustacttartteattauttenttesttextthattilttintToottorttouttrottufttwitwhew