ANT - Any of various insects in the family Formicidae in the order Hymenoptera, typically living in large colonies composed almost entirely of flightless females.
ANY - To even the slightest extent, at all.
IVY - Any of several woody, climbing, or trailing evergreen plants of the genus Hedera.
TAN - A symbol of the trigonometric function tangent.
TIN - A malleable, ductile, metallic element, resistant to corrosion, with atomic number 50 and symbol Sn.
VAN - A (covered) vehicle used for carrying goods or people, usually roughly cuboid in shape, longer and higher than a car but smaller than a truck.
VIA - A main road or highway, especially in ancient Rome. (Mainly used in set phrases, below.).
NIT - The egg of a louse.
NAY - No.
VAT - A large tub, such as is used for making wine or for tanning.
YIN - The essential female principle in some Eastern religions and philosophies.
NAVY - A country's entire sea force, including ships and personnel.
TINY - Very small.
VAIN - Overly proud of oneself, especially when concerning appearance.
ANTI - Describing a torsion angle between 90° and 180°.
VANITY - That which is vain, futile, or worthless; that which is of no value, use or profit.