As verbs the difference between use and express
is that
use is while
express is (
senseid) to convey or communicate; to make known or explicit.
As an adjective express is
(not comparable) moving or operating quickly, as a train not making local stops.
As a noun express is
a mode of transportation, often a train, that travels quickly or directly or
express can be (obsolete) the action of conveying some idea using words or actions; communication, expression.