surjection vs onto function

surjection and onto function both are nouns.

Word	Noun	Adjective	Verb	Adverb
surjection	Yes	No	No	No
onto function	Yes	No	No	No

As nouns, surjection and onto function are synonyms defined as:

surjection and onto function: a mathematical function that is an onto mapping.

Other synonyms of surjection include surjective function.

surjection (noun)	onto function (noun)
a mathematical function that is an onto mapping.	a mathematical function that is an onto mapping.