aperture
blue
bore
canker
chap
chink
cleft
corrode
corrosion
corrosivity
crack
cranny
crevice
crumbling
cyan
decrepit
degeneration
degradation
depletion
deterioration
dilapidated
fissure
foliage
hole
iron
leaf
metal
old
opening
orange
orifice
plate
ramshackle
red
russet
rust
sheet
slab
steel
tumbledown
wafer