Equestrian is someone on a horse (as pedestrian is someone on foot); an equestrienne is a woman on a horse (if you must make the distinction); and equine is like a horse, as in appearance or characteristics, or descriptive of horses.
Equestrian is also an adjective referring to horseback riding, as an equestrian statue; and equestrian statue; and equine is also a noun, i.e., a horse.
So the equ- in these words, from Latin equus, horse, is not to be confused with the equ- in the words of the previous section – that equ- is from aequus, equal.
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