different between combining vs combinatory

English

combining

combining (plural combinings)

The act by which things are combined or brought together.
- 1840-41, Charles Dickens, The Old Curiosity Shop
  these little combinings together, of friends, for objects in themselves extremely laudable, but which the law terms conspiracies

combine +? -atory

combinatory (comparative more combinatory, superlative most combinatory)

Of, relating to, or derived from a combination or combinations; combinative or combinatorial.
Having the ability to combine; combinable, combinational or combining.

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