air bladder vs swim bladder

air bladder and swim bladder both are nouns.

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

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

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

Other synonyms of air bladder include float.

air bladder (noun)	swim 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