Synonyms for Ambush (same or very similar meaning)
WordNet sense 1 (the act of concealing yourself and lying in wait to attack by surprise):
ambuscade, trap, lying in waitWordNet sense 2 (hunt (quarry) by stalking and ambushing):
still-huntWordNet sense 3 (wait in hiding to attack):
bushwhack, lurk, scupper, waylay, lie in waitFrom the ODE community, based on WordNetadd/edit