FIN - One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
FIT - Suitable, proper.
NET - A mesh of string, cord or rope.
TEN - A numerical value equal to 10; the number occurring after nine and before eleven, represented in Roman numerals as X, in Arabic numerals as 10, and in the hexadecimal system (base 16) as A.
TIE - A necktie (item of clothing consisting of a strip of cloth tied around the neck).
TIN - A malleable, ductile, metallic element, resistant to corrosion, with atomic number 50 and symbol Sn.
NIT - The egg of a louse.
TIC - A local and habitual convulsive motion of certain muscles.
FEN - A type of wetland fed by ground water and runoff, containing peat below the waterline.
CENT - A coin having face value of one cent (in either of the above senses).
CITE - To quote; to repeat, as a passage from a book, or the words of another.
FINE - Of superior quality.
NICE - Nicely.
TINE - A spike or point on an implement or tool, especially a prong of a fork or a tooth of a comb.
FEINT - To make a feint, or mock attack.
INFECT - To bring into contact with a substance that can cause illness (a pathogen).