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Gallaudet University: English Works: Suffixes to Know
There are several types of suffixes, noun suffixes, adjective suffixes, verb suffixes, and adverb suffixes. Learning the word endings will also enable you to recognize various parts of speech.
Ambleside Church of England Primary School
Ambleside: The Suffix/prefix Machine
Site allows elementary students to create hundreds of different words by adding and replacing prefixes and suffixes. Also includes a definition and explanation of the prefix and suffix.