There are a thousand threads on this site about coins with the same problem. Try to use the search feature and you'll find the answer.
Welcome to CT!! if you look in the upper right hand side of any screen you will see a "search" box. Type in "Penny missing letters" and click the "search titles only" button then see what comes up.
The Cent is a worn Die strike.. nothing major The Quarter is circulation wear When you are describing the words on any coin try using capital letters.. the words on coins are all in capital letters For example your title - 1991 penny missing letter l in liberty and the in on in god should actually be written this way.. 1991 Penny missing letter L in LIBERTY and the IN on IN GOD