CON - To study, especially in order to gain knowledge of.
NET - A mesh of string, cord or rope.
NOT - Negates the meaning of the modified verb.
ONE - A numerical value equal to 1; the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set. Ordinal: first.
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.
TOE - Each of the five digits on the end of the foot.
TON - A unit of weight (mass) equal to 2240 pounds (a long ton) or 2000 pounds (a short ton) or 1000 kilograms (a metric ton).
COT - A symbol of the trigonometric function cotangent.
TOT - A small child.
CENT - A coin having face value of one cent (in either of the above senses).
CONE - A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.
NEON - The chemical element (symbol Ne) with an atomic number of 10.
NONE - Not any (one) of a given number or group of things. With singular or plural concord.
NOTE - Use; employment.
ONCE - One and only one time.
TENT - A pavilion or portable lodge consisting of skins, canvas, or some strong cloth, stretched and sustained by poles, used for sheltering persons from the weather.
TONE - A specific pitch.
TOTE - A bag, specifically a tote bag.
CONTENT - That which is contained.