square block vs cube

square block and cube both are nouns.

Word	Noun	Adjective	Verb	Adverb
square block	Yes	No	No	No
cube	Yes	No	Yes	No

As nouns, square block and cube are synonyms defined as:

square block (noun)	cube (noun)
a block in the (approximate) shape of a cube	a block in the (approximate) shape of a cube
	any of several tropical American woody plants of the genus Lonchocarpus whose roots are used locally as a fish poison and commercially as a source of rotenone
	the product of three equal terms
	a hexahedron with six equal squares as faces
	a three-dimensional shape with six square or rectangular sides

square block (verb)	cube (verb)
	raise to the third power
	cut into cubes