There isn't any because the word gnat (you spelled it wrong) does not have a prefix or sufix. Not all words have prefixes or sufixes.
Affixes are prefixes, suffixes, infixes, and circumfixes. Prefixes are attached at the beginning of a word, while suffixes are attached at the end of a word. Infixes are inserted within a word, and circumfixes surround a word.
Improper
The three word elements of medical terminology are prefixes, roots, and suffixes. Prefixes are added to the beginning of a word, roots provide the core meaning of the word, and suffixes are added to the end of a word.
brevity
tion
Prefixes and suffixes in like a name like a person
prefixes for help: noneboth a prefix and a suffix for help:unhelpfulsuffixes for help:helperhelplesshelplessness (2 suffixes)helpfulhelpfulness (2 suffixes)helping
a prefixes is a group of letters that are fixed to the front of the root word. A suffixes is the main word for example dislike. dis is the prefixes and like is the suffixes
Improper
Prefixes: Aftershock. Suffixes: Shocked, shocks, shocking, shocker.
Non
brevity
Arch
Three.
un,
tion
passed