speaker

As nouns the difference between speaker and headset

is that speaker is one who speaks while headset is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone.

As nouns the difference between speaker and speakerphone

is that speaker is one who speaks while speakerphone is a telephone with a microphone and loudspeaker separate from those in the handset.

As nouns the difference between speaker and monitor

is that speaker is one who speaks while monitor is someone who watches over something; a person in charge of something or someone.

As a verb monitor is

to watch over; to guard.

As a proper noun Monitor is

any of several publications e.g. the "Christian Science Monitor".

As nouns the difference between speaker and transducer

is that speaker is one who speaks while transducer is a device that converts energy from one form into another.

As nouns the difference between speaker and listener

is that speaker is one who speaks while listener is someone who listens, especially to a speech or a broadcast.

As nouns the difference between megaphone and speaker

is that megaphone is a portable, usually hand-held, funnel-shaped device that is used to amplify a person’s natural voice toward a targeted direction while speaker is one who speaks.

As a verb megaphone

is to use a megaphone.

As nouns the difference between speakers and speaker

is that speakers is plural of lang=en while speaker is one who speaks.