architecture
block
build
building
caution
cautious
cement
city
concrete
construction
crane
danger
development
earphones
eyewear
goggles
green
hard
hat
headgear
headphones
headwear
health
helmet
house
housing
industrial
industry
personal
place
plastic
progress
protect
protection
protective
red
safe
safety
skyscraper
steel
stone
structure
tall
urban
workplace
workwear
yellow