Sphenodon punctatum vs tuatara

Sphenodon punctatum and tuatara both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sphenodon punctatum	Yes	No	No	No
tuatara	Yes	No	No	No

As nouns, Sphenodon punctatum and tuatara are synonyms defined as:

Sphenodon punctatum and tuatara: only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand

Sphenodon punctatum (noun)	tuatara (noun)
only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand	only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand