A suffix is a group of letters, often a syllable (technically a morpheme) that is added to the end of a word. Suffixes affect both the meaning and the part of speech of a word. Note that suffixes are "typical" of various parts of speech -- that means that some words that end with the letters of a suffix are not the typical part of speech. Also remember that KISS grammar determines the part of speech of a word by how it is used, not by its form, and not by what the dictionaries say. In "Go slow," "slow" is used as an adverb, and thus KISS grammar considers it to be one.
 

Suffixes Typical of Nouns

     Some suffixes are characteristic of nouns:
 

Suffixes Typical of Adjectives

     Some suffixes are characteristic of adjectives:
 

Suffixes Typical of Verbs

     Some suffixes are characteristic of verbs:
 

A Suffix Typical of Adverbs

     One suffix is characteristic of adverbs: