imperforate hymen vs hymen

imperforate hymen and hymen both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperforate hymen	Yes	No	No	No
hymen	Yes	No	No	No

As nouns, hymen is a hypernym of imperforate hymen; that is, hymen is a word with a broader meaning than imperforate hymen:

imperforate hymen: hymen that is completely closed so that menstrual blood cannot flow out
hymen: a fold of tissue that partly covers the entrance to the vagina of a virgin

Other hypernyms of imperforate hymen include maidenhead, virginal membrane.

imperforate hymen (noun)	hymen (noun)
hymen that is completely closed so that menstrual blood cannot flow out	a fold of tissue that partly covers the entrance to the vagina of a virgin