pineal body vs pineal gland

pineal body and pineal gland both are nouns.

Word	Noun	Adjective	Verb	Adverb
pineal body	Yes	No	No	No
pineal gland	Yes	No	No	No

As nouns, pineal body and pineal gland are synonyms defined as:

pineal body and pineal gland: a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin

Other synonyms of pineal body include epiphysis, epiphysis cerebri.

pineal body (noun)	pineal gland (noun)
a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin	a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin