vocal vs prothalamion

vocal and prothalamion both are nouns.

Word	Noun	Adjective	Verb	Adverb
vocal	Yes	Yes	No	No
prothalamion	Yes	No	No	No

As nouns, prothalamion is a hyponym of vocal; that is, prothalamion is a word with a more specific, narrower meaning than vocal:

vocal (noun)	prothalamion (noun)
music intended to be performed by one or more singers, usually with instrumental accompaniment	a song in celebration of a marriage
a short musical composition with words

vocal (adjective)	prothalamion (adjective)
having or using the power to produce speech or sound
relating to or designed for or using the singing voice
given to expressing yourself freely or insistently
full of the sound of voices