Bomb
tool
mass
The 4-letter word you're looking for is "cut." It refers to the action of removing excess parts from an object or material.
During the Fukushima Daiichi nuclear disaster in Japan, three of the reactors experienced hydrogen explosions. These explosions occurred in Reactors 1, 3, and 4.
used
GLOW. GLOW is a 4 letter word that can be used in place of the word 'Shine'
ears
lijt
eyes
gram
gold
· unit · urge · ugly · used