onto function vs surjective function

onto function and surjective function both are nouns.

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

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

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

Other synonyms of onto function include surjection.

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