Directly below
Under
Directly below; to make something visible.
Underexpose
Acting in secret
Undercover
A freshman or sophomore in high school/college.
Underclassmen
How heavy something is
weight
Fail to appreciate
Undervalue
not weighing enough
underweight
not having weight - noun
weightlessness
not having any weight - describing word
weightless
describing word that comes from weight
weighty