Lupinus albus vs lupin

Lupinus albus and lupin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lupinus albus	Yes	No	No	No
lupin	Yes	No	No	No

As nouns, lupin is a hypernym of Lupinus albus; that is, lupin is a word with a broader meaning than Lupinus albus:

Lupinus albus: white-flowered Eurasian herb widely cultivated for forage and erosion control
lupin: any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers

Other hypernyms of Lupinus albus include lupine.

Lupinus albus (noun)	lupin (noun)
white-flowered Eurasian herb widely cultivated for forage and erosion control	any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers