Suffixes -an-, -estr-.
The suffix "-an-" signifies a "member", an "inhabitant" of a country,
town, etc., or a member of a party, society, religion, etc. "Euxropano",
a European; "Londonano", a Londoner; "urbo", a town or city, "urbano",
a citizen; "klubo", a club, "klubano", a member of a club. "Ano", a
member.
"-estr-" denotes the "head" of a State, town, society, etc. "Regno",
a State, "regnestro", a ruler of a State; "urbestro", the head of a
town, a mayor; "lernejo", a school, "lernejestro", the principal or head
master of a school; "imperio", an empire, "imperiestro", an emperor.