Edible, elapse, emerge, empire, endive, engage, engine, entire, estate, excise and expire are 6 letter words. They begin and end with the letter E.
Alkali.
racecar
squawkstreak
Quaint is a 6 letter word that begins with the letter q and ends with t.
embalmemblemesteem
bamboo
talenttyrantteapottickettrivettenant
forsho
baobab.
Raiden
zealot
Six letter words that start and end with R:rafterraiderrancorrangerrapierraptorrasherratherreaderreaperrectorreeferrenderrenterrepairricherrigourringerripperrobberrockerrollerromperrooferrosterrubberrudderrunner