piece vs slice

piece and slice both are nouns.

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

As nouns, piece and slice are synonyms defined as:

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

Other hyponyms of piece include body part, corpus, acicula, base, corner, craton, cutting, fragment, hunk, lump, nub, stub, segment, strip, world.

As nouns, piece and slice are synonyms defined as:

piece (noun)	slice (noun)
a separate part of a whole	a golf shot that curves to the right for a right-handed golfer
game equipment consisting of an object used in playing certain board games	a spatula for spreading paint or ink
a portable gun	a serving that has been cut from a larger portion
a work of art of some artistic value	a thin flat piece cut off of some object
an item that is an instance of some type	a share of something
a distance	a wound made by cutting
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

piece (verb)	slice (verb)
repair by adding pieces	hit a ball so that it causes a backspin
eat intermittently; take small bites of	cut into slices
join during spinning	make a clean cut through
to join or unite the pieces of	hit a ball and put a spin on it so that it travels in a different direction
create by putting components or members together