WordNet sense 1 (the outermost level of the land or sea):

Earth's surface

WordNet sense 2 (information that has become public):

open

WordNet sense 3 (a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight):

airfoil, aerofoil, control surface

WordNet sense 4 (come to the surface):

rise, come up, rise up

WordNet sense 5 (put a coat on; cover the surface of; furnish with a surface):

coat

WordNet sense 6 (involving a surface only):

skin-deep, superficial

WordNet sense 7 (not deep or strong; not affecting one deeply):

shallow

WordNet sense 8 (appear or become visible; make a showing):

come on, come out, show up, turn up