According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern F--E-A. That is, six letter words with 1st letter F and 4th letter E and 6th letter A. In alphabetical order, they are:
fanega
favela
fraena
fedora, farina, fatima, fiesta, flicka, fajita, franca, fascia, fausta, fibula, fresca, frieda, fromla, frusta, futura...
Alkali.
racecar
squawkstreak
Quaint is a 6 letter word that begins with the letter q and ends with t.
zealot
talenttyrantteapottickettrivettenant
baobab.
forsho
bamboo
Raiden
embalmemblemesteem
Six letter words that start and end with R:rafterraiderrancorrangerrapierraptorrasherratherreaderreaperrectorreeferrenderrenterrepairricherrigourringerripperrobberrockerrollerromperrooferrosterrubberrudderrunner