Compound

Compound (chemistry), a combination of two or more elements.
Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall.

Compound (fortification), a version of the above fortified with defensive structures.

It is also found in combination with other words:

Compound chocolate, a chocolate substitute.
Compound fracture, complete fractures of bone where at least one fragment has damaged the skin, soft tissue or surrounding body cavity.
Compound interest, unpaid interest that is added to the principal so that subsequent interest is calculated on the grossed amount.
Compound locomotive, a locomotive in which exhaust steam is recycled in a low pressure cylinder or cylinders.
Compound sentence, a type of sentence made up of two or more independent clauses and no subordinate (dependent) clauses.