threshold function vs mapping

threshold function and mapping both are nouns.

Word	Noun	Adjective	Verb	Adverb
threshold function	Yes	No	No	No
mapping	Yes	No	No	No

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

threshold function: a function that takes the value 1 if a specified function of the arguments exceeds a given threshold and 0 otherwise
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 threshold function include function, map, mathematical function, single-valued function.

threshold function (noun)	mapping (noun)
a function that takes the value 1 if a specified function of the arguments exceeds a given threshold and 0 otherwise	(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)