ring snake vs ringneck snake

ring snake and ringneck snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring snake	Yes	No	No	No
ringneck snake	Yes	No	No	No

As nouns, ring snake and ringneck snake are synonyms defined as:

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

Other synonyms of ring snake include ring-necked snake.

ring snake (noun)	ringneck 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