action
activity
architecture
assembly
background
black
builder
building
clamps
clouds
construct
construction
daylight
frame
framework
hammer
harness
helmet
job
male
man
manual
metal
occupation
outdoor
people
plank
poles
profession
progress
rail
safety
scaffold
site
sky
space
steel
structure
tools
tradesman
upright
vertical
white
wood
work
worker
working
workman