to each one vs apiece

to each one and apiece both are adverbs.

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

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

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

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

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