Are frequency domain and Fourier space the same thing?

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What is the difference between frequency domain and Fourier space?

When we perform FFT on an image the result is in "frequency domain", right? How does this relate to Fourier space? I spent some time on Google and I found some people using the two terms interchangeably. However, in page 3 here: http://tinyurl.com/qcfc399 they are presented as different things. So, are they the same or different?

Thank you.