oyster bed vs oyster bank

oyster bed and oyster bank both are nouns.

Word	Noun	Adjective	Verb	Adverb
oyster bed	Yes	No	No	No
oyster bank	Yes	No	No	No

As nouns, oyster bed and oyster bank are synonyms defined as:

oyster bed and oyster bank: a workplace where oysters are bred and grown

Other synonyms of oyster bed include oyster park.

oyster bed (noun)	oyster bank (noun)
a workplace where oysters are bred and grown	a workplace where oysters are bred and grown