Is there a difference between a choke, a reactor, and an inductor?
While all 3 refer to the same type of component, an inductor, their usage is application specific.

reactor An electromagnetic device, the primary purpose of which is to introduce 
inductive reactance into a circuit. 

inductor A device consisting of one or more associated windings, with or without a magnetic core, for introducing inductance into an electric circuit. 

choke coil An inductor used in a special application to impede the current in a circuit over a specified frequency range while allowing relatively free passage of the current at lower frequencies.