Noun suffixes

 A suffix is a letter or group of letters added at the end of a word which makes a new word.

words	suffix	new words
forget, use	-ful	forgetful, useful
state, govern	-ment	statement, government
complicate, create	-ion	complication, creation

The new word is most often a different word class from the original word. In the table above, the suffix -ful has changed verbs to adjectives, -ment, and -ion have changed verbs to nouns. If you see a word ending in -ment, for example, it is likely to be a noun (e.g. commitment, contentment).

Suffixes: spelling

Often, the suffix causes a spelling change to the original word. In the table above, the -e ending of complicate and create disappears when the -ion suffix is added. Other examples of spelling changes include:

1. beauty, duty + -ful → beautiful, dutiful (-y changes to i)
2. heavy, ready + -ness → heaviness, readiness (-y changes to i)
3. able, possible + -ity → ability, possibility (-le changes to il)
4. permit, omit + -ion → permission, omission (-t changes to ss)   
             →For example, the following video gives some examples of noun suffixes:

→The following video is very interesting and it's got a great deal of examples:

Here's a link with a site with lots of examples and exercises:

Vocabulary building
→Here are some exercises to practise:

-ous/-y/-able/-ful

-our/-ment/-ion/-ity/-ce/-ship/-ing