Synonyms for Realisation (same or very similar meaning)
WordNet sense 1 (a musical composition that has been completed or enriched by someone other than the composer):
realization
WordNet sense 2 (coming to understand something clearly and distinctly):
recognition
WordNet sense 3 (making real or giving the appearance of reality):
actualization, actualisation
WordNet sense 4 (something that is made real or concrete):
fruition
From the ODE community, based on WordNet
add/edit