"Substantivize" Natural Recordings by Native Speakers
The word "substantivize" is a verb that means to convert something into a substance or to treat something as if it were a substance, or to attribute substance, reality, or importance to something.
In linguistics, substantivize specifically refers to the process of converting a verb or an adjective into a noun, often by adding a suffix or by functioning as a name. For example, in the phrase "the singing", "singing" is a participial form of the verb, but it's often referred to as a noun in a sentence like "Singing is my favorite hobby".
In a broader sense, to substantivize means to lend credibility or reality to something, often by treating it as if it were tangible or having weight.
Signifying or pertaining to facts, reality, or actual conditions; concrete and substantial, as opposed to abstract or theoretical. Sometimes, substantial.