thymus vs endocrine gland

thymus and endocrine gland both are nouns.

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

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

thymus: a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age
endocrine gland: any of the glands of the endocrine system that secrete hormones directly into the bloodstream

Other hypernyms of thymus include ductless gland, endocrine.

thymus (noun)	endocrine gland (noun)
a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age	any of the glands of the endocrine system that secrete hormones directly into the bloodstream