aged
background
barbed
barbs
barrier
boundary
confinement
corrosion
crime
danger
dirty
divided
enclosure
escape
fences
fencing
freedom
immigrate
immigration
imprisonment
military
old
pin
prick
prison
prohibited
protect
ranch
rugged
rust
rusty
scruffy
secrecy
security
shape
sharp
spike
spiky
steel
tarnished
tetanus
texture
trap
twist
twisted
wire