A nominalisation is where you turn a verb (process, technique, emotion) into an abstract noun.

For example:

• complete (verb) becomes completion (nominalisation ) 
• introduce (verb) becomes introduction (nominalisation)
• provide (verb) becomes provision (nominalisation)
• fail (verb) becomes failure (nominalisation)
• arrange (verb) becomes arrangement (nominalisation)

Like passive verbs, too many of them make writing very dull and heavy-going. Avoid them.

• Instead of
  We had a discussion about the matter
  Say
  We discussed the matter

• Instead of
  There will be a stoppage of trains by drivers
  Say
  Drivers will stop the trains
  ‍
• Instead of
  The implementation of the method has been done by a team
  Say
  A team has implemented the method