seminal vesicle vs duct gland

seminal vesicle and duct gland both are nouns.

Word	Noun	Adjective	Verb	Adverb
seminal vesicle	Yes	No	No	No
duct gland	Yes	No	No	No

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

seminal vesicle: either of a pair of glands located on either side of the male urinary bladder that open into the vas deferens and that secrete many components of semen during ejaculation
duct gland: a gland that secretes externally through a duct

Other hypernyms of seminal vesicle include exocrine, exocrine gland.

seminal vesicle (noun)	duct gland (noun)
either of a pair of glands located on either side of the male urinary bladder that open into the vas deferens and that secrete many components of semen during ejaculation	a gland that secretes externally through a duct