aqualung vs scuba

aqualung and scuba both are nouns.

Word	Noun	Adjective	Verb	Adverb
aqualung	Yes	No	No	No
scuba	Yes	No	No	No

As nouns, aqualung and scuba are synonyms defined as:

aqualung and scuba: a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus

Other synonyms of aqualung include Aqua-Lung.

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