As a homeowner, he is responsible for paying property taxes on time.

homeowner 是复合名词，由 home（家）和 owner（所有者）组成，字面意思是"家的主人"，即"房主"。 owner 是名词，来自动词 own（拥有）加后缀 -er 构成，表示"拥有某物的人"。