speaker

One who speaks.

Loudspeaker.

Speakerphone.

The chair or presiding officer of certain legislative bodies, such as the U.K. House of Commons or the U.S. House of Representatives.

One who makes a speech to an audience.

“The company hired a motivational speaker to boost morale.”

A book containing passages of text for use in speeches.

The producer of a given utterance (text, etc), whether actually spoken or e.g. written.

A key on a woodwind instrument of the clarinet family (cf octave key on other instruments) which induces the instrument to overblow.