DIG - To move hard-packed earth out of the way, especially downward to make a hole with a shovel. Or to drill, or the like, through rocks, roads, or the like. More generally, to make any similar hole by moving material out of the way.
DUG - Mammary gland on domestic mammal containing more than two breasts.
GUT - The alimentary canal, especially the intestine.
RID - Released from an obligation, problem, etc. (usually followed by "of").
RIG - The rigging of a sailing ship or other such craft.
RUG - A partial covering for a floor.
RUT - Sexual desire or oestrus of cattle, and various other mammals.
TUG - To pull or drag with great effort.
GIT - A contemptible person.
DIRT - Soil or earth.
DRUG - A substance used to treat an illness, relieve a symptom, or modify a chemical process in the body for a specific purpose.
GRID - A rectangular array of squares or rectangles of equal size, such as in a crossword puzzle.
GRIT - Collection of hard small materials, such as dirt, ground stone, debris from sandblasting or other such grinding, swarf from metalworking.
TURGID - Distended beyond the natural state by some internal agent, especially fluid, or expansive force.