LET - To allow to, not to prevent (+ infinitive, but usually without to).
NET - A mesh of string, cord or rope.
PEN - An enclosed area used to contain domesticated animals, especially sheep or cattle.
PET - An animal kept as a companion.
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.
YEP - Yes.
YET - To melt; found; cast, as metal.
PLY - A layer of material. (two-ply toilet paper).
LYE - A strong caustic alkaline solution of potassium or sodium salts, obtained by leaching wood ashes. It is much used in making soap as well as its use in biodiesel.
TYPE - A grouping based on shared characteristics; a class.
LENT - Simple past tense and past participle of lend.
PELT - The skin of a beast with the hair on; a raw or undressed hide; a skin preserved with the hairy or woolly covering on it.
YELP - An abrupt, high-pitched noise or utterance.
PENT - Confined in a pen, imprisoned.
PLENTY - A more than adequate amount.