redbelly vs red-bellied turtle

redbelly and red-bellied turtle both are nouns.

Word	Noun	Adjective	Verb	Adverb
redbelly	Yes	No	No	No
red-bellied turtle	Yes	No	No	No

As nouns, redbelly and red-bellied turtle are synonyms defined as:

redbelly and red-bellied turtle: freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell

Other synonyms of redbelly include Pseudemys rubriventris, red-bellied terrapin.

redbelly (noun)	red-bellied turtle (noun)
freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell	freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell