virginal membrane vs hymen

virginal membrane and hymen both are nouns.

Word	Noun	Adjective	Verb	Adverb
virginal membrane	Yes	No	No	No
hymen	Yes	No	No	No

As nouns, virginal membrane and hymen are synonyms defined as:

virginal membrane and hymen: a fold of tissue that partly covers the entrance to the vagina of a virgin

Other synonyms of virginal membrane include maidenhead.

virginal membrane (noun)	hymen (noun)
a fold of tissue that partly covers the entrance to the vagina of a virgin	a fold of tissue that partly covers the entrance to the vagina of a virgin