Speaker Frequency Range and Frequency Response
Frequency range is a largely useless marketing term.

Frequency response is a real engineering term.  It tells you the input voltage to output sound power across the audio frequency range (20 Hz to 20 kHz).  From that you can decide what "frequency range" the speaker has, but based on the parameters you actually care about.

For example, for demanding high end audio applications, you might want the frequency response to be within 3 dB of flat.  You look at the frequency response graph and see over what frequency range that is true for.  On the other hand, if this is a less demanding application, like a public address system, you might care more about efficiency or maximum sound output power within some distortion limit.

To summarize, frequency response is the raw facts.  Frequency range is someone else looking at the raw facts, deciding what's important or what they can get away with, and telling you the min/max frequency the speaker is good for, whatever "good" means.