activity
building
busy
concept
construction
crowd
danger
dig
digger
ditch
effort
energy
engineering
equipment
excavate
excavation
fence
hardhat
helmet
job
looking
machinery
manual
manufacturing
metal
metalwork
metalworker
net
occupation
partnership
people
pipe
pipeline
project
protective
safety
site
skill
symbol
task
team
teamwork
together
tool
trench
tube
welder
welding
work
worker