air
appearance
apprehend
arrest
aspect
attach
background
bar
barbed
blink
blue
bristly
cage
catgut
chord
close
cloud
confine
confinement
custody
day
daylight
dungeon
encase
enclose
enfold
eye
ferro
free
freedom
funicular
gaol
gut
heaven
immure
incarcerate
interlock
iron
light
look
mew
notion
pen
penitentiary
pent up
prickly
prison
prospect
regard
respect
scrutiny
seal
shut
shutter
sight
sky
spiny
streak
string
to zip up
view
white
wire