Catachrestical is a complex and rarely used word that means the misuse or incorrect use of words or language. Some useful synonyms for this word include malapropism, misuse, misapplication, and misnomer. Malapropism refers to the use of a word that is similar in sound but not in meaning to the intended word. Misuse is a broader term that covers any incorrect or inappropriate use of language. Misapplication is similar to misuse but specifically refers to the incorrect use of a rule or principle. Finally, misnomer is a term used to describe the incorrect naming of a person, place, or thing. All of these synonyms can help to convey the meaning of catachrestical in a clearer and more accessible way.