Suffixes

A suffix is a group of letters placed at the end  of a word to make a new  word. A suffix can make a new word in one of two ways:

1. inflectional (grammatical): for example, changing singular to plural (dog → dogs ), or changing present tense to past tense (walk → walked ). In this case, the basic meaning of the word does not change.
2. derivational (the new word has a new meaning, "derived " from the original word): for example, teach → teacher  or care → careful

Inflectional suffixes

Inflectional suffixes do not change the meaning of the original word. So in "Every day I walk to school" and "Yesterday I walked to school", the words walk and walked  have the same basic meaning. In "I have one car" and "I have two cars", the basic meaning of the words car and cars  is exactly the same. In these cases, the suffix is added simply for grammatical "correctness". Look at these examples:

Derivational suffixes

With derivational suffixes, the new word has a new meaning , and is usually a different part of speech. But the new meaning is related to the old meaning - it is "derived" from the old meaning.

We can add more than one suffix, as in this example:

There are several hundred derivational suffixes. Here are some of the more common ones:

sources : Original Link