The term 'CODE WORD FOR Z' can be solved by the crossword solution 'ZULU', which is a four-letter word. ZULU is a language spoken by the ZULU people, who are an ethnic group of Southern Africa. The language is also known as IsiZulu and is one of the 11 official languages of South Africa. It is the most widely spoken language in the country and is used in many other countries in the region. ZULU is also used as a code word for the letter 'Z' in some contexts.