Argus
Cassandra
Charley
Jeremiah
Texas tower
activities
activity
admonisher
affair
affairs
airplane spotter
airscape
alert
bag
beacon
belvedere
bleachers
bridge
business
cautioner
cityscape
cloudscape
commerce
concern
concernment
conning tower
cupola
custodianship
custody
difficulty
eagle eye
employ
employment
enterprise
espial
espionage
fire patrolman
fire warden
fireguard
flagman
forward observer
function
gallery
gazebo
grandstand
guard
guardedness
guardianship
headache
interest
look
looking
looking at
protect
security guard
watcher
watchman
beware
keep one's eyes open
keep one's eyes peeled
keep one's eyes skinned
look after
mind
sentinel
cookout