| A | B |
| subconscious | that portion of mental activity of which the individual has little or no conscious perception |
| subject | owing alliegance to another (ex: subject of the king) |
| submarine | a war ship that operates under water |
| submerge | to sink beneath the surface of water |
| subterranean | beneath the earth's surface |
| subtotal | less than complete |
| subtle | hard to detect; sly |
| subvert | to overthrow or destroy |
| substructure | acting as support; foundation |
| substitute | a person or a thing used in place of another |