i agree with tumpliner , that we should read these words in a context , to give you the exact meaning ............................................. Fixer and Positioning meaning ( from Oxford Dictionary ) Fixer : 1- informal - a person who arranges things for other people, sometimes dishonestly Example: a great political fixer 2 - a chemical substance used in photography to prevent a photograph from changing and becoming too dark ............................................. POSITIONING : [n] the act of putting something in a certain place or location [adj] causing to fall into line or into position . http://www.hyperdictionary.com/dictionary/positioning

Can you give a context, please? I don't think they are similar enough to worry about, unless I can see the context.