Synonyms for Victoria Falls (same or very similar meaning)
WordNet sense 1 (a waterfall in the Zambezi River on the border between Zimbabwe and Zambia; diminishes seasonally):
Victoria
WordNet sense 2 (a large waterfall on the border between Argentina and Brazil):
Iguassu, Iguazu, Iguassu Falls, Iguazu Falls
From the ODE community, based on WordNet
add/edit