caller

a social or business visitor; "the room was a mess because he hadn't expected company"

an investor who buys a call option

the bettor in a card game who matches the bet and calls for a show of hands

a person who announces the changes of steps during a dance; "you need a fiddler and a caller for country dancing"

someone who proclaims or summons in a loud voice; "the callers were mothers summoning their children home for dinner"

the person who convenes a meeting; "who is the caller of this meeting?"

the person initiating a telephone call; "there were so many callers that he finally disconnected the telephone"

providing coolness; "a cooling breeze"; "`caller' is a Scottish term as in `a caller breeze'"

fresh; "caller fish"