From Teflpedia

Nominalisation or nominalization (/ˌnɒmɪnəlaɪˈzeɪʃən/) 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.

Generally these are formed by adding noun suffixes such as -ion, -tion, -ment, -ity, -ty, -ness or -ing (the last for gerunds).

Nominalisation is very common in the academic English register. It’s also what we use on this wiki, so for example the verb nominalise, adjective/past participle nominalised both redirect to this page.

Note phrasal nouns - nominalised phrasal verbs.