Mentha spicata vs spearmint

Mentha spicata and spearmint both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mentha spicata	Yes	No	No	No
spearmint	Yes	No	No	No

As nouns, Mentha spicata and spearmint are synonyms defined as:

Mentha spicata and spearmint: common garden herb having clusters of small purplish flowers and yielding an oil used as a flavoring

Mentha spicata (noun)	spearmint (noun)
common garden herb having clusters of small purplish flowers and yielding an oil used as a flavoring	common garden herb having clusters of small purplish flowers and yielding an oil used as a flavoring