| A | B |
|---|
| forefather | a distant relative |
| subterranean | deep below the ground/earth |
| foremost | being outstanding, important |
| foreground | part closest to the viewer |
| forerunner | warning |
| forearm | upper arm between the wrist and elbow |
| submerge | going underwater |
| subconscious | instinctive part of the mind |
| submarine | a ship moving under the surface of the water |
| forecaster | someone predicting the future |
| subdivision | divided groups; a small section that is part of a larger section |
| substandard | poor; not meeting the requirements in quality |
