Balloon filler is a term used to describe a device that is used to fill balloons with air or helium. There are several synonyms for the term "balloon filler" which can be used interchangeably. One of them is "balloon inflator" which refers to a device that inflates balloons with air or gas. Another synonym is "balloon pump" which is a mechanical device that is used to pump air into balloons. Other synonyms include "balloon blower" and "balloon compressor". All these terms refer to a device that helps to inflate balloons and can be used in a variety of settings such as parties, events and celebrations.