labium vs external body part

labium and external body part both are nouns.

Word	Noun	Adjective	Verb	Adverb
labium	Yes	No	No	No
external body part	Yes	No	No	No

As nouns, external body part is a hypernym of labium; that is, external body part is a word with a broader meaning than labium:

labium: a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva)
external body part: any body part visible externally

labium (noun)	external body part (noun)
a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva)	any body part visible externally