to turn something, especially an adjective or verb, into a noun "In the process of writing, she often nominalizes verbs to create more complex sentences."
verb [vt. 及物动词](使)名词化
The scientist nominalized the adjective 'rapid' by turning it into 'rapidity'. 这位科学家将形容词“迅速的”进行了名词化处理,将其改写为“迅速性”。