sex gland vs endocrine gland

sex gland and endocrine gland both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex gland	Yes	No	No	No
endocrine gland	Yes	No	No	No

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

sex gland: a gland in which gametes (sex cells) are produced
endocrine gland: any of the glands of the endocrine system that secrete hormones directly into the bloodstream

Other hypernyms of sex gland include ductless gland, endocrine.

sex gland (noun)	endocrine gland (noun)
a gland in which gametes (sex cells) are produced	any of the glands of the endocrine system that secrete hormones directly into the bloodstream