irks — to irritate, annoy, or exasperate: It irked him to wait in line.
lurks — to lie or wait in concealment, as a person in ambush; remain in or around a place secretly or furtively.
perks — to become lively, cheerful, or vigorous, as after depression or sickness (usually followed by up): The patients all perked up when we played the piano for them.
works — exertion or effort directed to produce or accomplish something; labor; toil.