ductless gland vs endocrine gland

ductless gland and endocrine gland both are nouns.

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

As nouns, ductless gland and endocrine gland are synonyms defined as:

ductless gland and endocrine gland: any of the glands of the endocrine system that secrete hormones directly into the bloodstream

Other synonyms of ductless gland include endocrine.

ductless gland (noun)	endocrine gland (noun)
any of the glands of the endocrine system that secrete hormones directly into the bloodstream	any of the glands of the endocrine system that secrete hormones directly into the bloodstream