horned asp vs viper

horned asp and viper both are nouns.

Word	Noun	Adjective	Verb	Adverb
horned asp	Yes	No	No	No
viper	Yes	No	No	No

As nouns, viper is a hypernym of horned asp; that is, viper is a word with a broader meaning than horned asp:

horned asp: highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
viper: venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw

horned asp (noun)	viper (noun)
highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye	venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw