oyster bank vs oyster bed

oyster bank and oyster bed both are nouns.

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

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

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

Other synonyms of oyster bank include oyster park.

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