As nouns the difference between terms and firster
is that terms is 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.
terms
English
Noun
(head)
Statistics
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firster
English
Noun
(
en noun)
(in combination) A person who advocates the primacy of the named entity (who puts it first)