ION - An atom or group of atoms bearing an electrical charge such as the sodium and chlorine atoms in a salt solution.
LOB - To throw or hit a ball into the air in a high arch.
OIL - Liquid fat.
BIN - A container used for storage.
BIO - A biography.
NIL - Nothing; zero.
BILL - Any of various bladed or pointed hand weapons, originally designating an Anglo-Saxon sword, and later a weapon of infantry, especially in the 14th and 15th centuries, commonly consisting of a broad, heavy, double-edged, hook-shaped blade, with a short pike at the back and another at the top, attached to the end of a long staff.
BOIL - A localized accumulation of pus in the skin, resulting from infection.
LION - A big cat, Panthera leo, native to Africa, India and formerly to much of Europe. The term may apply to the species as a whole, to individuals, or to male individuals. It also applies to related species like mountain lions.
LOIN - The part of the body (of humans and quadrupeds) at each side of the backbone, between the ribs and hips.
BOLL - The rounded seed-bearing capsule of a cotton or flax plant.
BILLION - A milliard, a thousand million: 1 followed by nine zeros, 10^9.