Enclitics are small words that are attached to the end of other words, such as "-s" in "cats" or "-ed" in "walked." They are different from suffixes because they do not change the meaning of the word they are attached to. Some synonyms for enclitic include proclitic, affix, clitic, particle, and postfix. Proclitics are similar to enclitics, but they come before the word they are attached to. Affixes are often used to modify the meaning of a word. Clitics, like enclitics, are small words, but they can also stand alone as independent words. Particles are similar to clitics, but they often have a more grammatical function. Postfixes are similar to affixes, but they come after the base word.