branch
chuck
clamp
dirty
disposal
dump
earth
environment
environmental
equipment
excavator
garbage
heap
heavy
industrial
industry
junk
junkyard
ladle
land
landfill
loader
machinery
old
outdoors
pollution
power
recycle
recycling
road
rubbish
rust
rusty
scrap
steel
street
tractor
trash
tree
truck
vehicle
waste
work
yard
yellow