creek bed vs streambed

creek bed and streambed both are nouns.

Word	Noun	Adjective	Verb	Adverb
creek bed	Yes	No	No	No
streambed	Yes	No	No	No

As nouns, creek bed and streambed are synonyms defined as:

creek bed and streambed: a channel occupied (or formerly occupied) by a stream

creek bed (noun)	streambed (noun)
a channel occupied (or formerly occupied) by a stream	a channel occupied (or formerly occupied) by a stream