The term 'FORM OF WORDS' can be solved by two crossword solutions: FORMULA (7 letters) and IDIOM (5 letters). A FORMULA is a set of symbols or words expressing a mathematical rule or principle. It is often used in science and mathematics to describe the relationships between different elements. An IDIOM is an expression that has a figurative meaning which is different from its literal meaning. It is often used in everyday language to convey a particular sentiment or emotion.