ANT - Any of various insects in the family Formicidae in the order Hymenoptera, typically living in large colonies composed almost entirely of flightless females.
FIN - One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
INN - Any establishment where travellers can procure lodging, food, and drink.
TAN - A symbol of the trigonometric function tangent.
TIN - A malleable, ductile, metallic element, resistant to corrosion, with atomic number 50 and symbol Sn.
NAN - Affectionate name for a grandmother.
NIT - The egg of a louse.
ANTI - Describing a torsion angle between 90° and 180°.
FAINT - Lacking strength; weak; languid; inclined to swoon; as, faint with fatigue, hunger, or thirst.
INFANT - A very young human being, from birth to somewhere between six months and two years of age, needing almost constant care and/or attention.