white ash vs Fraxinus Americana

white ash and Fraxinus Americana both are nouns.

Word	Noun	Adjective	Verb	Adverb
white ash	Yes	No	No	No
Fraxinus Americana	Yes	No	No	No

As nouns, white ash and Fraxinus Americana are synonyms defined as:

white ash and Fraxinus Americana: spreading American ash with leaves pale green or silvery beneath and having hard brownish wood

white ash (noun)	Fraxinus Americana (noun)
spreading American ash with leaves pale green or silvery beneath and having hard brownish wood	spreading American ash with leaves pale green or silvery beneath and having hard brownish wood
small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips