Suffixes are added to the end of words to make new words. The suffixes -ment, -ence and -y can be used with a number of verbs to make nouns.
Sometimes the spelling of the verb changes slightly when a suffix is used.
| 
 | The suffix -y | 
 | The suffix -ment | 
 | The suffix -ence | 
| recover | recovery | improve | improvement | prefer | preference | 
| discover | discovery | postpone | postponement | exist | existence | 
| injure | injury | arrange | arrangement | interfere | interference | 
| deliver | delivery | entertain | entertainment | refer | reference | 
| apologize | apology | develop | development | differ | difference |