Texas bluebonnet vs lupin

Texas bluebonnet and lupin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Texas bluebonnet	Yes	No	No	No
lupin	Yes	No	No	No

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

Texas bluebonnet: low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States
lupin: any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers

Other hypernyms of Texas bluebonnet include lupine.

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

Texas bluebonnet: closely resembles Lupinus subcarnosus; southwestern United States (Texas)
lupin: any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers

Other hypernyms of Texas bluebonnet include lupine.

Texas bluebonnet (noun)	lupin (noun)
low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States	any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers
closely resembles Lupinus subcarnosus; southwestern United States (Texas)