seeI can see for miles from up here.
noticeI noticed a crack in the ceiling.
perceiveBill perceived a tiny figure in the distance.
observeformalA teacher observed her climbing over the gate.
spotWe managed to spot a leopard.
catch sight ofWe looked for the bird and caught sight of it just as it flew off.
glimpseI glimpsed her as she ducked round the corner.
witnessDid anyone witness the attack?
make outI could just make out a figure standing in the doorway.
clap/lay/set eyes onI've never laid eyes on him before.