silk gland vs secretory organ

silk gland and secretory organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
silk gland	Yes	No	No	No
secretory organ	Yes	No	No	No

As nouns, secretory organ is a hypernym of silk gland; that is, secretory organ is a word with a broader meaning than silk gland:

silk gland: silk-producing gland of insects (especially of a silkworm) or spiders
secretory organ: any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream

Other hypernyms of silk gland include gland, secreter, secretor.

silk gland (noun)	secretory organ (noun)
silk-producing gland of insects (especially of a silkworm) or spiders	any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream