female genital organ vs female genitals

female genital organ and female genitals both are nouns.

Word	Noun	Adjective	Verb	Adverb
female genital organ	Yes	No	No	No
female genitals	Yes	No	No	No

As nouns, female genital organ and female genitals are synonyms defined as:

Other synonyms of female genital organ include fanny, female genitalia.

female genital organ (noun)	female genitals (noun)
external female sex organs	external female sex organs