When it comes to describing two things that are in immediate contact, the phrase 'be contiguous' is often used. However, there are other synonyms that can be used to describe this situation. The word 'adjacent' is a commonly used synonym that means two things are next to each other without any space in between. 'Touching' is another synonym, indicating that two things are in contact with each other. 'Bordering' suggests that two things are located next to each other, with one serving as the boundary to the other. 'Conjoining' means to bring two things together in contact. 'Neighboring' implies that two things are adjacent and close together. All of these synonyms can be used to convey the same meaning as 'be contiguous'.