Answer: suffix

AnswerCrossword Clue
SUFFIXConjugation addition, often
SUFFIXIt's always at the end
SUFFIXLess, when added?
SUFFIXWord adjunct.
SUFFIXFollow-up letters?
SUFFIX-esque or -ology
SUFFIXTacked-on letters
suffixto add to the end of a root word
suffixA morpheme added at the end of a word to form a derivative, e.g., -ation, -fy, -ing, -itis