abstract
aged
backdrop
background
bar
blame
break
brown
decay
design
detail
duration
firewood
format
furrow
gist
gnarl
grain
groove
hardwood
heartwood
inwardness
juice
line
log
lumber
material
molder
mortise
natural
naturally
nature
old
pattern
physical
raw
rough
stalk
stem
structure
style
surface
texture
textured
timber
tree
trunk
wall
wart
wood