I think the difference becomes clear when one separates individuals from institutions. Science is an institution, and unlike individuals, has no opinions, emotions, thoughts, or feelings. Science is not a philosophy, nor is it a school of though; rather, it is a method of inquiry that is used and shared by individuals to objectively investigate phenomenon available to the senses(either directly or indirectly.) The goal of this institution is to create inductive models than are used to explain, predict, and categorize these phenomenon.
Scientism, based on the definition given, is a philosophical position held by individuals who, like all other people, have opinions and philosophical and ideological preferences. Such a position is not part of the institution of science, nor is it a position that is capable of being falsified or verified by the method of science.
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