The term SUFFIX WITH IDEAL can be broken down into two parts: a suffix and the word 'IDEAL'. A suffix is a word part that is added to the end of a root word to change its meaning. In this case, the suffixes ISM and IST are being added to the word 'IDEAL' to create two new words. The suffix ISM is used to refer to a system of thought or belief, while the suffix IST is used to refer to a person who follows a particular system of thought or belief. Therefore, the crossword solutions for the term SUFFIX WITH IDEAL are ISM and IST, which refer to a system of thought or belief and a person who follows such a system, respectively.