nominalismista
Nominalismista is a term that appears to be a neologism, likely combining "nominalism" with a suffix indicating adherence or a group. Nominalism itself is a philosophical view in metaphysics that denies the existence of abstract objects. In its strongest form, nominalism asserts that only particular things exist. Universals, such as properties (like redness) or relations (like being taller than), are considered not to have an independent existence but are merely names or labels that we apply to groups of similar particulars.
A "nominalismista" might therefore refer to an individual who strongly adheres to or advocates for nominalist