Natural vs normal vs resonant frequencies

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PhysicsKid0123
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is there a difference between natural frequencies, normal frequencies, and resonant frequencies? Any subtle differences? I've seen them used at different times, and I've also seen at least two used in a single sentence implying some kind of difference. For example, "Natural Frequencies and Normal Modes of a Spinning Timoshenko Beam With General Boundary Conditions."
 
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A vibration mode describes a type of vibration an object can undergo. Normal modes are the set of orthogonal modes, I.e. set of modes from which all possible vibrations can be expressed.

Each normal mode occurs with a particular resonant or natural frequency.
 
So then normal, natural, and resonant frequencies, are all the same or equivalent?