sand viper vs hognose snake

sand viper and hognose snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand viper	Yes	No	No	No
hognose snake	Yes	No	No	No

As nouns, sand viper and hognose snake are synonyms defined as:

sand viper and hognose snake: harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed

Other synonyms of sand viper include puff adder.

sand viper (noun)	hognose snake (noun)
highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye	harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed
harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed