The phrase "most having" can be replaced with several synonyms, depending on the context. If referring to a majority of people or things possessing a certain trait or characteristic, alternatives might include "majority holding," "predominantly possessing," or "largely having." If discussing the highest level or degree of something, possible substitutes include "utmost possessing," "maximum having," or "peak holding." In a similar vein, the term "most endowed with" might be used to convey a sense of individuals or things possessing superior qualities or advantages. Additionally, "most possessing" or "most abundant in" could convey the sense of a quantity or quality being particularly prevalent among a group of people or things.