Roman hyacinth vs Hyacinthus orientalis albulus

Roman hyacinth and Hyacinthus orientalis albulus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman hyacinth	Yes	No	No	No
Hyacinthus orientalis albulus	Yes	No	No	No

As nouns, Roman hyacinth and Hyacinthus orientalis albulus are synonyms defined as:

Roman hyacinth and Hyacinthus orientalis albulus: hyacinth with loosely flowered spikes, several growing from one bulb

Roman hyacinth (noun)	Hyacinthus orientalis albulus (noun)
hyacinth with loosely flowered spikes, several growing from one bulb	hyacinth with loosely flowered spikes, several growing from one bulb