isles of Langerhans vs islets of Langerhans

isles of Langerhans and islets of Langerhans both are nouns.

Word	Noun	Adjective	Verb	Adverb
isles of Langerhans	Yes	No	No	No
islets of Langerhans	Yes	No	No	No

As nouns, isles of Langerhans and islets of Langerhans are synonyms defined as:

isles of Langerhans and islets of Langerhans: cell clusters in the pancreas that form the endocrine part of that organ; secrete insulin and other hormones

Other synonyms of isles of Langerhans include islands of Langerhans.

isles of Langerhans (noun)	islets of Langerhans (noun)
cell clusters in the pancreas that form the endocrine part of that organ; secrete insulin and other hormones	cell clusters in the pancreas that form the endocrine part of that organ; secrete insulin and other hormones