gall bladder vs bladder

gall bladder and bladder both are nouns.

Word	Noun	Adjective	Verb	Adverb
gall bladder	Yes	No	No	No
bladder	Yes	No	No	No

As nouns, bladder is a hypernym of gall bladder; that is, bladder is a word with a broader meaning than gall bladder:

gall bladder: a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion
bladder: a distensible membranous sac (usually containing liquid or gas)

Other hypernyms of gall bladder include vesica.

gall bladder (noun)	bladder (noun)
a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion	a bag that fills with air
	a distensible membranous sac (usually containing liquid or gas)