The term 'HEAD WORD' is a crossword solution composed of two words. The first WORD, 'HEAD, ' is a three-letter WORD meaning 'a person in charge of a group or organization.' The second WORD, 'WORD, ' is a four-letter WORD meaning 'a unit of language that expresses an idea or concept.' Together, the two words form the phrase 'HEAD WORD, ' which is used to refer to the most important WORD in a phrase or sentence. It is typically the WORD that carries the most weight in terms of meaning and is often the subject of the phrase or sentence.