aid
background
build
builder
cap
construction
constructor
contractor
copy
danger
dangerous
employee
engineer
engineering
equipment
first
hardhat
hat
head
header
headgear
helmet
industrial
industry
job
maintenance
manufacture
manufacturing
material
nobody
notepad
occupation
orange
plain
plastic
professional
project
protect
protection
protective
safe
safety
space
top
view
wear
white
wood
work
worker