Necturus maculosus vs mud puppy

Necturus maculosus and mud puppy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Necturus maculosus	Yes	No	No	No
mud puppy	Yes	No	No	No

As nouns, Necturus maculosus and mud puppy are synonyms defined as:

Necturus maculosus and mud puppy: aquatic North American salamander with red feathery external gills

Necturus maculosus (noun)	mud puppy (noun)
aquatic North American salamander with red feathery external gills	aquatic North American salamander with red feathery external gills
	larval salamander of mountain lakes of Mexico that usually lives without metamorphosing
	large salamander of North American rivers and streams