headset

As a noun headset

is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As nouns the difference between audio and headset

is that audio is audio 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 headset and echo

is that headset is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone while echo is echo (a reflected sound that is heard again by its initial observer).

As a noun headset

is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone.

As an adjective undefined is

lacking a definition or value.

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 headset and helmet

is that headset is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone while helmet is a protective head covering.

As nouns the difference between headset and handsfree

is that headset is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone while handsfree is a handsfree phone.

As an adjective handsfree is

that can be used without using the hands, hands-free.

As nouns the difference between headset and handle

is that headset is a pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone while handle is a part of an object which is held in the hand when used or moved, as the haft of a sword, the knob of a door, the bail of a kettle, etc or handle can be (slang) a name, nickname or pseudonym.

As a verb handle is

to use the hands.