piece vs building block

piece and building block both are nouns.

Word	Noun	Adjective	Verb	Adverb
piece	Yes	No	Yes	No
building block	Yes	No	No	No

piece (noun)	building block (noun)
a separate part of a whole	a block of material used in construction work
game equipment consisting of an object used in playing certain board games	a single undivided natural thing occurring in the composition of something else
a portable gun
a work of art of some artistic value
an item that is an instance of some type
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

piece (verb)	building block (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