The word "seifu" is a Japanese term that refers to the head of a household or a landowner. There are several synonyms for "seifu" that can be used in various contexts. For instance, "okamisan" is a polite term that means "mistress of the house." "Shujin" is another term that can be used to refer to the head of a household or an employer. "Yadoya" is a term that refers to a landlord or an innkeeper. Other possible synonyms for "seifu" include "kacho" (boss), "shacho" (company president), and "ryoshu" (owner). When using these alternative terms, it's important to consider the context and social position of the person being referred to.