As nouns the difference between fister and firster
is that fister is someone partakes in fisting while firster is (in combination) a person who advocates the primacy of the named entity (who puts it first).
As an adjective firster is
(obsolete) earlier, former.
fister
English
Noun
Someone partakes in fisting
firster
English
Noun
(
en noun)
(in combination) A person who advocates the primacy of the named entity (who puts it first)