As adjectives the difference between lighter and looser
is that
lighter is (
light) or
lighter can be (
light) while
looser is (
loose).
As nouns the difference between lighter and looser
is that
lighter is one who, or that which, lights or
lighter can be a flat-bottomed boat for carrying heavy loads across short distances (especially for canals or for loading or unloading larger boats) while
looser is .
As a verb lighter
is to transfer cargo or fuel from a ship, lightening it to make its draft less or to make it easier to refloat.