Armpit and Pit

Armpit noun - The hollow under the arm where it is joined to the shoulder.

Pit is a synonym for armpit in clean topic. In some cases you can use "Pit" instead a noun "Armpit", when it comes to topics like underarm.

Pit noun - A sunken area forming a separate space.

Armpit is a synonym for pit in clean topic. You can use "Armpit" instead a noun "Pit".