square matrix vs diagonal

square matrix and diagonal both are nouns.

Word	Noun	Adjective	Verb	Adverb
square matrix	Yes	No	No	No
diagonal	Yes	Yes	No	No

square matrix (noun)	diagonal (noun)
a matrix with the same number of rows and columns	a punctuation mark (/) used to separate related items of information
	an oblique line of squares of the same color on a checkerboard
	(mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
	a line or cut across a fabric that is not at right angles to a side of the fabric
	(geometry) a straight line connecting any two vertices of a polygon that are not adjacent

square matrix (adjective)	diagonal (adjective)
	having an oblique or slanted direction
	connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face