parathyroid gland vs parathyroid

parathyroid gland and parathyroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
parathyroid gland	Yes	No	No	No
parathyroid	Yes	No	No	No

As nouns, parathyroid gland and parathyroid are synonyms defined as:

parathyroid gland and parathyroid: any one of four endocrine glands situated above or within the thyroid gland

parathyroid gland (noun)	parathyroid (noun)
any one of four endocrine glands situated above or within the thyroid gland	any one of four endocrine glands situated above or within the thyroid gland