A communication system is a set of tools used to facilitate the exchange of information between two or more parties. The two crossword solutions for this term are 'LANGUAGE' and 'intercom'. LANGUAGE is a system of symbols, signs, and sounds used to communicate with others. It is composed of words, grammar, and pronunciation that are used to convey meaning. Intercoms are electronic devices used to transmit audio signals over a distance, usually within a building or complex. They are often used in businesses, schools, and other organizations to facilitate communication between staff members.