In nautical terms the difference between dolphin and mouse
is that
dolphin is a man-made semi submerged maritime structure, usually installed to provide a fixed structure for temporary mooring, to prevent ships from drifting to shallow water or to serve as base for navigational aids while
mouse is a turn or lashing of spun yarn or small stuff, or a metallic clasp or fastening, uniting the point and shank of a hook to prevent its unhooking or straighening out.
As nouns the difference between dolphin and mouse
is that
dolphin is a carnivorous aquatic mammal inhabiting mostly in the shallower seas of the continental shelves, famed for its intelligence and occasional willingness to approach humans while
mouse is any small rodent of the genus
Mus.
As a verb mouse is
to move cautiously or furtively, in the manner of a mouse (the rodent) (
frequently used in the phrasal verb to mouse around).