caller

noun

1.
a social or business visitor
company
Derived from:
call
2.
an investor who buys a call option
3.
the bettor in a card game who matches the bet and calls for a show of hands
Derived from:
call
4.
a person who announces the changes of steps during a dance
caller-out
Derived from:
call
5.
someone who proclaims or summons in a loud voice
Derived from:
call
6.
the person who convenes a meeting
Derived from:
call
7.
the person initiating a telephone call
caller-up phoner telephoner
Derived from:
call