The term 'suffix for DIFFER' can be solved with two crossword solutions: ENCE (4 letters) and ENT (3 letters). ENCE is a suffix that is commonly used to form adjectives from nouns, verbs, or other adjectives. For example, the word 'DIFFERENCE' can be formed by adding ENCE to the verb 'DIFFER'. ENT is a suffix that is used to form nouns from verbs, adjectives, or other nouns. For example, the word 'DIFFERENTIAL' can be formed by adding ENT to the adjective 'DIFFER'.