Building blocks added at the end of a word (prefixs):
-er and -ist (person who acts)
-esse (female)
-ing (ongoing)
-or (thing that acts)
-self
-s (multiple)
-th, st, nd, rd (rank)
-ed (past tense)
-ed (past perfect tense, finished)
-y (adjective)
-ly (adverb)
Examples of suffix(e)s: