belle de nuit vs Ipomoea alba

belle de nuit and Ipomoea alba both are nouns.

Word	Noun	Adjective	Verb	Adverb
belle de nuit	Yes	No	No	No
Ipomoea alba	Yes	No	No	No

As nouns, belle de nuit and Ipomoea alba are synonyms defined as:

belle de nuit and Ipomoea alba: pantropical climber having white fragrant nocturnal flowers

Other synonyms of belle de nuit include moonflower.

belle de nuit (noun)	Ipomoea alba (noun)
pantropical climber having white fragrant nocturnal flowers	pantropical climber having white fragrant nocturnal flowers