scuba vs aqualung

scuba and aqualung both are nouns.

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

As nouns, scuba and aqualung are synonyms defined as:

scuba and aqualung: 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 scuba include Aqua-Lung.

scuba (noun)	aqualung (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