internal secretion vs hormone

internal secretion and hormone both are nouns.

Word	Noun	Adjective	Verb	Adverb
internal secretion	Yes	No	No	No
hormone	Yes	No	No	No

As nouns, internal secretion and hormone are synonyms defined as:

internal secretion and hormone: the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect

Other synonyms of internal secretion include endocrine.

internal secretion (noun)	hormone (noun)
the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect	the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect