ring snake vs ring-necked snake

ring snake and ring-necked snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring snake	Yes	No	No	No
ring-necked snake	Yes	No	No	No

As nouns, ring snake and ring-necked snake are synonyms defined as:

ring snake and ring-necked snake: any of numerous small nonvenomous North American snakes with a yellow or orange ring around the neck

Other synonyms of ring snake include ringneck snake.

ring snake (noun)	ring-necked snake (noun)
harmless European snake with a bright yellow collar; common in England	any of numerous small nonvenomous North American snakes with a yellow or orange ring around the neck
any of numerous small nonvenomous North American snakes with a yellow or orange ring around the neck