salivary gland vs duct gland

salivary gland and duct gland both are nouns.

Word	Noun	Adjective	Verb	Adverb
salivary gland	Yes	No	No	No
duct gland	Yes	No	No	No

As nouns, duct gland is a hypernym of salivary gland; that is, duct gland is a word with a broader meaning than salivary gland:

salivary gland: any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion
duct gland: a gland that secretes externally through a duct

Other hypernyms of salivary gland include exocrine, exocrine gland.

salivary gland (noun)	duct gland (noun)
any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion	a gland that secretes externally through a duct