grass snake vs ringed snake

grass snake and ringed snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass snake	Yes	No	No	No
ringed snake	Yes	No	No	No

As nouns, grass snake and ringed snake are synonyms defined as:

grass snake and ringed snake: harmless European snake with a bright yellow collar; common in England

Other synonyms of grass snake include Natrix natrix, ring snake.

grass snake (noun)	ringed snake (noun)
harmless European snake with a bright yellow collar; common in England	harmless European snake with a bright yellow collar; common in England
any of numerous nonvenomous longitudinally-striped viviparous North American and Central American snakes
either of two North American chiefly insectivorous snakes that are green in color