onto function vs surjection

onto function and surjection both are nouns.

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

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

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

Other synonyms of onto function include surjective function.

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