Physisorbed refers to the process in which a substance is physically adsorbed onto a surface of another substance. There are several synonyms for this term, each with its own nuances and connotations. One synonym is adsorbed, which refers to the process of a molecule or substance sticking to the surface of another substance. Another synonym is absorbed, which refers to the process of a substance being taken up by another substance. Other synonyms for physisorbed include attached, adhered, bound, and fixed. Ultimately, the choice of synonym will depend on the specific context and intended meaning of the term.