Duplexes are popular forms of housing where two separate living units are joined together by a common wall. Synonyms for duplexes include "twin homes," "semi-detached houses," and "double houses." In some areas, duplexes may also be referred to as "doubles" or "paired homes." Another term used for a duplex is a "duplex apartment," which typically refers to an apartment complex where each unit spans two levels. Other related terms include "townhomes," "rowhouses" or "terraced houses," which may also refer to attached homes that share one or more walls with their neighbors. No matter which term you use, duplexes are a versatile and practical housing solution that offers many benefits to homeowners and renters alike.