lactogen vs prolactin

lactogen and prolactin both are nouns.

Word	Noun	Adjective	Verb	Adverb
lactogen	Yes	No	No	No
prolactin	Yes	No	No	No

As nouns, prolactin is a hyponym of lactogen; that is, prolactin is a word with a more specific, narrower meaning than lactogen:

lactogen: any agent that enhances milk production
prolactin: gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition

Other hyponyms of lactogen include lactogenic hormone, luteotropin.

lactogen (noun)	prolactin (noun)
any agent that enhances milk production	gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition