different between constructing vs forming

English

constructing

constructing (plural constructings)

An act of construction.
- 2002, Anne Lancashire, London Civic Theatre: City Drama and Pageantry from Roman Times to 1558
  Only the construction of wood and canvas castles, temples, and the like would require some time: and not as much as might be thought, given both London's fixed structures - such as conduits, and the Cross in Cheapside - upon which and around which structures could be erected, and London's practice in the frequent necessary constructings of such pageants.

forming

forming (plural formings)

The act by which something is formed; formation.
- 1987, Jeffrey K. Zeig, The Evolution of Psychotherapy
  […] a creative person, whose specific formings of behavior are not easily predictable […]

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