to convert (another part of speech) into a noun, as in changing the adjective lowly into the lowly or the verb legalize into legalization, as in changing he drinks to his drinking in I am worried about his drinking.
r nominalisation is the use of a word which is not a noun (e.g. a verb, an adjective or an adverb) as a noun, or as the head of a noun phrase, with or without morphological transformation. The term can also refer specifically to the process of producing a noun from another part of speech via the addition of derivational affixes (e.g., legalize versus legalization).[1]