larynx vs vocal organ

larynx and vocal organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
larynx	Yes	No	No	No
vocal organ	Yes	No	No	No

As nouns, vocal organ is a hypernym of larynx; that is, vocal organ is a word with a broader meaning than larynx:

larynx: a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech
vocal organ: any of the organs involved in speech production

Other hypernyms of larynx include organ of speech, speech organ, cartilaginous structure.

larynx (noun)	vocal organ (noun)
a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech	any of the organs involved in speech production