larynx vs voice box

larynx and voice box both are nouns.

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

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

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

larynx (noun)	voice box (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