common dolphin vs Delphinus delphis

common dolphin and Delphinus delphis both are nouns.

Word	Noun	Adjective	Verb	Adverb
common dolphin	Yes	No	No	No
Delphinus delphis	Yes	No	No	No

As nouns, common dolphin and Delphinus delphis are synonyms defined as:

common dolphin and Delphinus delphis: black-and-white dolphin that leaps high out of the water

common dolphin (noun)	Delphinus delphis (noun)
black-and-white dolphin that leaps high out of the water	black-and-white dolphin that leaps high out of the water