Fraxinus quadrangulata vs blue ash

Fraxinus quadrangulata and blue ash both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fraxinus quadrangulata	Yes	No	No	No
blue ash	Yes	No	No	No

As nouns, Fraxinus quadrangulata and blue ash are synonyms defined as:

Fraxinus quadrangulata and blue ash: ash of central and southern United States with bluish-green foliage and hard brown wood

Fraxinus quadrangulata (noun)	blue ash (noun)
ash of central and southern United States with bluish-green foliage and hard brown wood	ash of central and southern United States with bluish-green foliage and hard brown wood