The next letters on the list, if it comes to it, which it probably will, are epsilon, zeta, eta and theta. (B.1.1.7s new name is Alpha.) Currently, there are no plans on how to label the variants after the 24 letters of the Greek alphabet are used up. These old names are not abandoned. ALPHA, BETA, gamma, delta.
Epsilinos is a very long word.
( z0 word :ARG1-of ( z1 long :degree ( z2 very ) ) :domain ( z3 person :name ( z4 name :op "insurgent" :op "Epsilinos" ) ) )
(z0 / word
    :ARG1-of (z1 / long-03
                 :degree (z2 / very))
    :domain (z3 / person
                :name (z4 / name
                          :op1 "insurgent"
                          :op1 "Epsilinos")))
Epsilinos is a very long word .
z3 :name z4
z4 :op1 1
z4 :op1 0
z1 :degree z2
z0 :ARG1-of z1
z0 :domain z3