Suffix

A suffix is a few letters put at the end of a word to change its meaning. "suffix." The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. 12 Aug. 2007. <Dictionary.com http://dictionary.reference.com/browse/suffix>. It is a type of affix mostly used to show inflection.

Verb examples:
 -ed
 -or
 -ing
 -s
 es
 -ing
 walk
 walked
 walker
 walking
 walks
 wishes

Adjective examples:
 -er
 -est
 -ful
 -ness
 -less

 easy
 easier
 easiest
 handful
 kindness
 baseless 

Compare to prefix. Prefixes are letters put at the beginning of a word to change its meaning.

 References 

Category:Grammar
Category:Linguistics terminology