Ipomoea alba vs morning glory

Ipomoea alba and morning glory both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ipomoea alba	Yes	No	No	No
morning glory	Yes	No	No	No

As nouns, morning glory is a hypernym of Ipomoea alba; that is, morning glory is a word with a broader meaning than Ipomoea alba:

Ipomoea alba: pantropical climber having white fragrant nocturnal flowers
morning glory: any of various twining vines having funnel-shaped flowers that close late in the day

Ipomoea alba (noun)	morning glory (noun)
pantropical climber having white fragrant nocturnal flowers	any of various twining vines having funnel-shaped flowers that close late in the day