apiece vs to each one

apiece and to each one both are adverbs.

Word	Noun	Adjective	Verb	Adverb
apiece	No	No	No	Yes
to each one	No	No	No	Yes

As adverbs, apiece and to each one are synonyms defined as:

apiece and to each one: to or from every one of two or more (considered individually)

Other synonyms of apiece include each, for each one, from each one.

apiece (adverb)	to each one (adverb)
to or from every one of two or more (considered individually)	to or from every one of two or more (considered individually)