Copiously
Genocide is tha word using "G,C" in it.
The word you can make using the letters s, t, a, c, and t is "acts."
The letters c e k o p t can be rearranged to make the word pocket.
crayon
There are no words in the English lanuage using these letters.
Using the letters provided, you can form several words, including "carousel," "scare," "local," "scale," and "soul." Other combinations could include "sore," "causal," and "sauce." The exact number of words will depend on the allowed word length and the specific rules for word formation.
glen can be one using G L N E. pen can be another using N E P. But if you want to know what word you can make using ALL of the letters then I have no clue.
Codger
rescore
You can create several words using the letters C, A, T, I, T, and N, including "cat," "tin," "tan," "act," and "tic." Additionally, the six-letter word "attic" can also be formed. Other combinations may yield shorter words as well.
choice
Unscrambling the letters, c r i u n, will give you the words incur and runic. If you don't use all 5 of the letters, you can also make the words, in, un, nu, urn, run, ruin, cur, and uric.