The phrase "is adjacent" is often used to describe something situated next to or close to another thing. Some synonyms for this phrase include "is next to", "is neighboring", "is contiguous", "is proximate", "is bordering", and "is abutting". Each of these synonyms can be used interchangeably to convey the idea of proximity or adjacency between two or more objects or locations. When using synonyms, it is important to consider the context and intended meaning to ensure that the most accurate and appropriate word is selected.