LOT - A large quantity or number; a great deal.
OUT - Away from home or one's usual place, or not indoors.
TOO - Likewise.
COT - A symbol of the trigonometric function cotangent.
COOK - A person who prepares food for a living.
COOL - Having a slightly low temperature; mildly or pleasantly cold.
CULT - A group of people with a religious, philosophical or cultural identity sometimes viewed as a sect, often existing on the margins of society or exploitative towards its members.
LOCK - Something used for fastening, which can only be opened with a key or combination.
LOOK - To try to see, to pay attention to with one's eyes.
LUCK - Something that happens to someone by chance, a chance occurrence.
TOOK - Simple past of take.
TOOL - A mechanical device intended to make a task easier.
TUCK - To fit neatly.
CLOT - A solidified mass of blood.
COLT - A young male horse.
LOOT - Plunder, booty, especially from a ransacked city.
CLOUT - Influence or effectiveness, especially political.
LOCKOUT - The opposite of a strike, a labor disruption where management refuses to allow workers into a plant to work even if they are willing.