eigenvalue vs characteristic root of a square matrix

eigenvalue and characteristic root of a square matrix both are nouns.

Word	Noun	Adjective	Verb	Adverb
eigenvalue	Yes	No	No	No
characteristic root of a square matrix	Yes	No	No	No

As nouns, eigenvalue and characteristic root of a square matrix are synonyms defined as:

eigenvalue and characteristic root of a square matrix: (mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant

Other synonyms of eigenvalue include eigenvalue of a matrix, eigenvalue of a square matrix.

eigenvalue (noun)	characteristic root of a square matrix (noun)
(mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant	(mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant