As nouns the difference between carbon and squash
is that
carbon is alternative form of
(l) while
squash is (uncountable) a sport played in a walled court with a soft rubber ball and bats like tennis racquets or
squash can be (countable) a plant and its fruit of five species of the genus
cucurbita , or gourd kind or
squash can be (obsolete|zoo|countable) muskrat.
As a verb squash is
to beat or press into pulp or a flat mass; to crush.