Bellows and Hollo

Bellows noun - A mechanical device that blows a strong current of air; used to make a fire burn more fiercely or to sound a musical instrument.

Hollo is a synonym for bellows. In some cases you can use "Hollo" instead a noun "Bellows".

Hollo noun - A very loud utterance (like the sound of an animal).

Bellows is a synonym for hollo. Sometimes you can replace term "Bellows" with "Hollo", this nouns are similar.