voice box vs larynx

voice box and larynx both are nouns.

Word	Noun	Adjective	Verb	Adverb
voice box	Yes	No	No	No
larynx	Yes	No	No	No

As nouns, voice box and larynx are synonyms defined as:

voice box and larynx: a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech

voice box (noun)	larynx (noun)
a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech	a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech