flowering ash vs Fraxinus ornus

flowering ash and Fraxinus ornus both are nouns.

Word	Noun	Adjective	Verb	Adverb
flowering ash	Yes	No	No	No
Fraxinus ornus	Yes	No	No	No

As nouns, flowering ash and Fraxinus ornus are synonyms defined as:

flowering ash and Fraxinus ornus: southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna

Other synonyms of flowering ash include manna ash.

flowering ash (noun)	Fraxinus ornus (noun)
southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna	southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna
shrubby ash of southwestern United States having fragrant white flowers
shrubby California ash with showy off-white flowers