"Most invoked" is a phrase that means the action that is performed more often than any other. Some synonyms for "most invoked" include "most utilized," "most employed," and "most called upon." These phrases imply that a particular action, process, or object is used extensively or is heavily relied upon. Other synonyms for "most invoked" could include "most prevalent," "most common," or "most frequented." These words suggest that the action or object in question is widespread and popular amongst a particular group. Ultimately, the synonym used will depend on the context in which the phrase is used and the intended emphasis that the speaker or writer wishes to convey.