swim bladder vs air bladder

swim bladder and air bladder both are nouns.

Word	Noun	Adjective	Verb	Adverb
swim bladder	Yes	No	No	No
air bladder	Yes	No	No	No

As nouns, swim bladder and air bladder are synonyms defined as:

swim bladder and air bladder: an air-filled sac near the spinal column in many fishes that helps maintain buoyancy

Other synonyms of swim bladder include float.

swim bladder (noun)	air bladder (noun)
an air-filled sac near the spinal column in many fishes that helps maintain buoyancy	an air-filled sac near the spinal column in many fishes that helps maintain buoyancy