surjection vs mapping

surjection and mapping both are nouns.

Word	Noun	Adjective	Verb	Adverb
surjection	Yes	No	No	No
mapping	Yes	No	No	No

As nouns, mapping is a hypernym of surjection; that is, mapping is a word with a broader meaning than surjection:

surjection: a mathematical function that is an onto mapping.
mapping: (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)

Other hypernyms of surjection include function, map, mathematical function, single-valued function.

surjection (noun)	mapping (noun)
a mathematical function that is an onto mapping.	(genetics) the process of locating genes on a chromosome
	the process of making maps
	(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)