Common words:
* Offer: To present something for acceptance or rejection.
* Transfer: To move something from one place to another.
* Differ: To be unlike or dissimilar.
* Confer: To discuss something with someone.
* Suffer: To experience pain or hardship.
* Prefer: To like one thing more than another.
* Infer: To conclude something from evidence.
* Refer: To direct someone to another source.
* Defer: To postpone something.
* Counterfer: To imitate or counterfeit something.
Less common words:
* Affer: To state positively (archaic).
* Afferent: Carrying impulses towards a central organ (in biology).
* Counteroffer: A response to an offer, usually with changes.
* Interfer: To intervene in something.
* Proffer: To offer something formally or ceremoniously.
* Reffer: To refer to something again.
* Specifier: Something that specifies or defines something else.
Note: The suffix "fer" is often used in words related to actions, processes, or states of being. It is often combined with prefixes to create new words with specific meanings.