In the United States a condominium is a form of fee ownership of a unit in a multi unit complex. An apartment (sometimes called a flat) is typically a rental property consisting of a room or suite of rooms in a building containing a number of such dwellings.
Always, you can own a condominium. And some condominiums are called apartments. You cannot always own an apartment. When you cannot own an apartment, it is not a condominium.
The official difference is in ownership: an apartment is owned by a landlord who may also own other apartments in the same complex; a condominium is owned by a single owner and that ownership includes a percentage ownership in the community's common areas. A condominium may be in the style of an apartment, especially, in urban high-rise buildings.
A condominium is an apartment that is owned by the resident rather than a landlord.
Attached condominiums are attached to something: a garage or another condominium. A detached condominium is not attached to anything.
The difference between an apartment and a suit is that a suite is a 2 room unit. An apartment has several rooms.
A condominium unit is a single unit in a condominium project, whether residential or commercial. A condominium phase is a development period, during which a developer builds, finishes and/or sells a set or collection of condominium units.
A sanitorium (or sanitarium) is a medical facility for long-term illness. A condominium is a form of real estate ownership.
With a condominium, you own only the structure itself. With a townhome, you also own the yard surrounding your building.
Depending on the context, these two terms could mean the same thing: other descriptions for a residence or commercial space. Usually an apartment is the name of a residence in a building where there are other residences -- typically more than four. There are locales where one can purchase their 'apartment', and its ownership is either in the style of condominium or co-op. In condominium and co-op governing documents, sometimes a residence is called a 'unit' meaning a residential unit or a commercial unit.
a villa is ground level. it comes from spanish/mexican for dwelling. a condominium can be on ground level, but is always in a high rise building
a flat is bigger
Regardless of your location, a villa is a style of residence: condominium is a form of real estate ownership without a definition of the residence style.