-er
- a person having to do with, esp. as an occupation or profession: added to nouns: hatter, geographer
- a person native to or living in: added to place names and nouns: New Yorker, cottager
- a thing or action connected with: added to nouns, noun compounds, and noun phrases
- a person or thing that ____s: added to verbs: roller
- forming the comparative degree of many adjectives and adverbs: later, greater
- the action of ____ing: added to verb bases in legal language: demurrer, repleader
- repeatedly: added to verbs and verb bases: flicker, patter
See -er in American Heritage Dictionary 4