throwing knife (knife designed and weighted so that it can be thrown effectively, typically as a weapon or for competitions of knife-throwing skill)

(evolutionary theory) kin selection (an evolutionary strategy that favors an individual organism's close kin over itself)

life table, mortality table (a table which shows, for each age, what the probability is that a person of that age will die before their next birthday)

police station

A treacherous move in a confrontation

(business) service level

(military) marching orders

button mushroom, champignon (Agaricus bisporus, a species of mushroom commonly used in cooking)

essential

(nautical) foremast (the mast nearest the bow, on a ship with more than one mast)