basing — the bottom support of anything; that on which a thing stands or rests: a metal base for the table.
bracing — If you describe something, especially a place, climate, or activity as bracing, you mean that it makes you feel fresh and full of energy.
casing — A casing is a substance or object that covers something and protects it.
chasing — the act of chasing; pursuit: The chase lasted a day.
facing — the front part of the head, from the forehead to the chin.
pacing — a rate of movement, especially in stepping, walking, etc.: to walk at a brisk pace of five miles an hour.
placing — a particular portion of space, whether of definite or indefinite extent.
racing — a contest of speed, as in running, riding, driving, or sailing.
spacing — the unlimited or incalculably great three-dimensional realm or expanse in which all material objects are located and all events occur.
tracing — a surviving mark, sign, or evidence of the former existence, influence, or action of some agent or event; vestige: traces of an advanced civilization among the ruins.
Three-syllable rhymes
debasing — to reduce in quality or value; adulterate: They debased the value of the dollar.
defacing — to mar the surface or appearance of; disfigure: to deface a wall by writing on it.