Isthmuses refers to narrow strips of land that connect two larger landmasses, often separating two bodies of water. Synonyms for isthmuses include necks, land bridges, spits, and strips. These terms are used according to the specific characteristics of the isthmus in question. A neck is a narrow strip of land that connects two larger land areas, while a land bridge refers to a wider expanse of land over a body of water. A spit is a long, narrow strip of land that extends into a body of water, while a strip refers to a thin area of land separating two water bodies. These synonyms are often used interchangeably to describe different types of isthmuses.