unit vs piece

unit and piece both are nouns.

Word	Noun	Adjective	Verb	Adverb
unit	Yes	No	No	No
piece	Yes	No	Yes	No

unit (noun)	piece (noun)
an assemblage of parts that is regarded as a single entity	a separate part of a whole
a single undivided whole	game equipment consisting of an object used in playing certain board games
an organization regarded as part of a larger social group	a portable gun
a single undivided natural thing occurring in the composition of something else	a work of art of some artistic value
any division of quantity accepted as a standard of measurement or exchange	an item that is an instance of some type
an individual or group or structure or other entity regarded as a structural or functional constituent of a whole	a distance
	a musical work that has been created
	an artistic or literary composition
	an instance of some kind
	a serving that has been cut from a larger portion
	a portion of a natural object
	a share of something
	a period of indeterminate length (usually short) marked by some action or condition

unit (verb)	piece (verb)
	repair by adding pieces
	eat intermittently; take small bites of
	join during spinning
	to join or unite the pieces of
	create by putting components or members together