| shadowing(verb, adjective, catching, spying, spotting) |
| sighting(verb, adjective, catching, spying, spotting) |
| sizing up(verb, adjective, catching, spying, spotting) |
| sleuthing(verb, adjective, catching, spying, spotting) |
| slugging(verb, adjective, catching, spying, spotting) |
| snooping(verb, adjective, catching, spying, spotting) |
| sorting out(verb, adjective, catching, spying, spotting) |
| spotting(verb, adjective, catching, spying, detecting) |
| spying(verb, adjective, catching, spotting, detecting) |
| stagging(verb, adjective, catching, spying, spotting) |
| staking out(verb, adjective, catching, spying, spotting) |
| staring(verb, adjective, catching, spying, spotting) |
| staring at(verb, adjective, catching, spying, spotting) |
| surveying(verb, adjective, catching, spying, spotting) |
| sussing out(verb, adjective, catching, spying, spotting) |
| tabbing(verb, adjective, catching, spying, spotting) |
| tailing(verb, adjective, catching, spying, spotting) |
| taking a gander(verb, adjective, catching, spying, spotting) |
| taking a look(verb, adjective, catching, spying, spotting) |
| taking in(verb, adjective, catching, spying, spotting) |