mud puppy vs ambystomid

mud puppy and ambystomid both are nouns.

Word	Noun	Adjective	Verb	Adverb
mud puppy	Yes	No	No	No
ambystomid	Yes	No	No	No

As nouns, ambystomid is a hypernym of mud puppy; that is, ambystomid is a word with a broader meaning than mud puppy:

mud puppy: larval salamander of mountain lakes of Mexico that usually lives without metamorphosing
ambystomid: small to moderate-sized terrestrial or semiaquatic New World salamander

Other hypernyms of mud puppy include ambystomid salamander.

mud puppy (noun)	ambystomid (noun)
aquatic North American salamander with red feathery external gills	small to moderate-sized terrestrial or semiaquatic New World salamander
larval salamander of mountain lakes of Mexico that usually lives without metamorphosing
large salamander of North American rivers and streams