achievement
beam
bright
bulb
business
businessman
challenge
creative
creativity
earth
easy
electric
electricity
energy
genius
globe
goal
hard
heavy
idea
illuminate
illumination
innovation
inspiration
intelligence
intelligent
invention
lamp
lever
lift
light
lightbulb
man
observe
planet
power
simple
smart
solution
solve
strategy
success
successful
watch
weight
wood
woodean
world