cooter vs river cooter

cooter and river cooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
cooter	Yes	No	No	No
river cooter	Yes	No	No	No

As nouns, cooter and river cooter are synonyms defined as:

cooter and river cooter: large river turtle of the southern United States and northern Mexico

Other synonyms of cooter include Pseudemys concinna.

cooter (noun)	river cooter (noun)
large river turtle of the southern United States and northern Mexico	large river turtle of the southern United States and northern Mexico