adult
angle
back
background
blue
construction
copy
danger
dangerous
day
electric
electrical
electrician
electricity
energy
engineer
engineering
helmet
high
industry
installation
line
lines
low
main
male
man
outdoors
outside
person
power
safety
sky
space
system
talkie
technology
testing
text
tower
transmission
view
volt
voltage
walkie
watt
wiring
work
worker
working