Subtractive synthesis is a sound generating module that combines waves in a variety of amplitudes, frequencies, and phases. This is the definition of additive synthesis.
Subtractive synthesis is a sound generating module that can play back samples. This is the definition of a sampler.
Subtractive synthesis is a sound generating module that reduces rich sound waves in a variety of amplitudes. This doesn't make sense.
Subtractive synthesis is a sound generating technique that combines a rich sound sound and one or more filters to create a new color. Excellent!