> A landlord is the owner of a house, apartment, condominium, land, or real estate which is rented or leased to an individual or business

How is that different from "property owner"? The difference is that to you, a native English speaker, landlord is a word you're familiar with. To others, it's a whole new word they need to learn, whereas property-owner is self-descriptive. It's like using good variable names in your code, you don't need to look up the definition of every word when you use re-use words that are common.