Common Suffixes:
* -er: (denoting an agent or doer)
* baker
* writer
* dancer
* singer
* teacher
* player
* reader
* driver
* walker
* swimmer
* runner
* -or: (denoting an agent or doer)
* actor
* conductor
* inventor
* operator
* supervisor
* governor
* senator
* editor
* visitor
* translator
* collaborator
* -tor: (denoting an agent or doer)
* creator
* director
* elevator
* dictator
* generator
* navigator
* operator
* regulator
* translator
Less Common Suffixes:
* -ior: (denoting an agent or doer)
* superior
* inferior
* junior
* senior
* -sor: (denoting an agent or doer)
* censor
* assessor
* advisor
* compressor
* precursor
Other Uses of "-or":
* -or can also be part of a word, not necessarily as a suffix, like in:
* horror
* odor
* motor
* color
This is just a small sample; there are many more words with the suffix "-or" in the English language.