The quality of a long word having t he same first and last letter is described by Dmitri Borgmann as 'consistent sesquipedalianism'. In "Language on Vacation" Dmitri displays a list of 26 words, each beginning and ending with the same letter, giving an example for every letter of the alphabet. I have substituted three of the words on this list with shorter ones suggested by Dmitri himself, because the original terms do not comply with my standards of acceptability which will be outlined shortly.
"Consistent Sesquipedalianism Update,"
Word Ways: Vol. 24
, Article 9.
Available at: https://digitalcommons.butler.edu/wordways/vol24/iss2/9