The best replacement for dam is damn.

The best alternatives to dam are rated as following:
★★★★★  damn
★★★  sire
★★★  levee
★★  dike
★  not to dam
★  john cena
★  dps
★  cms
★  reservoir
★  barrage
★  dame
★  weir
★  levy
★  dyke
★  hoover dam
★  sabu
  doe
  mam
  jerry lynn
  no dam
  idm
  glen canyon
  ecm
  red rock canyon
  embankment
  dean ambrose
  levi
  boulder dam
  three gorges dam
  jean claude van damme
  segal

Your alternative for dam is not listed? Suggest!
Speaking about dam, one probably shouldn't forget about spillway.

Other search terms related to dam and their ratings are:
★★★★★ spillway
You have in mind a companion for dam and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dam in all years. Click on graph for more.
dam
damn
sire