Aqua-Lung and Breathing device

Aqua-Lung noun - A device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus.

Breathing device and Aqua-Lung are semantically related. In some cases you can use "Breathing device" instead a noun phrase "Aqua-Lung".

Breathing device noun - A device that facilitates breathing in cases of respiratory failure.

Aqua-Lung and breathing device are semantically related. Sometimes you can replace phrase "Aqua-Lung" with "Breathing device", this phrases are similar.