Excavation rhymes with:
activation, aggravation, depravation, deprivation, derivation, elevation, innovation, motivation, renovation, activation, aggravation, conservation, cultivation, depravation, deprivation, derivation, elevation, inactivation, innovation, motivation, observation, ovation, preservation, privation, renovation, reservation, salvation, starvation, univation
Excavation sounds like:
egyptian, exception, exhibition, expedition