However, there are words derived from "public" that use prefixes and suffixes:
Prefixes:
* Im-: Impublic (rare, meaning not public)
* Un-: Unpublic (rare, meaning not public)
Suffixes:
* -ly: Publicly (adverb meaning in a public way)
* -ation: Publication (the act of making something public)
* -ize: Publicize (to make something known to the public)
* -ity: Publicity (the state of being public or well-known)
Let me know if you have any other word you'd like to explore prefixes and suffixes for!