Apiece is an adverb.
A synonym for apiece is "Each".
You can abbreviate "apiece" as "ea." Short and sweet, just like me.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The word apiece means "each" (per piece).
The cakes cost a dollar apiece.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.