Abstract :
Language always concerns with words furthermore its vocabulary. One of the
ways to enrich vocabulary is learning morphology which studies about word
formation and the part of morphological process is derivational suffixes. This
research is aimed to describe types of derivational suffixes and word formation in
derivational suffixes. It is categorized into descriptive qualitative research where
the researcher describes in the sentences without using statistical calculation. All
words used by Steve Jobs when he delivered his speech are the data source while
words which containing derivational suffixes is the data. Instruments of the
research are the researcher herself and the text of Steve Jobs? speech. To analyze
the data, it uses Miles and Huberman?s theory (1994: 10) said those are data
reduction, data display, and conclusion. The findings result was gained 74
derivational suffixes consists of four types of derivational suffixes, noun, verbal,
adjective, and adverb suffixes and also explains its word formation. Finally,
derivational suffixes is necessary to learn and to apply by breaking the word into
its elements foot and suffixes because of knowing these elements, we can build
the words by themselves. It can increase our self-confidence and avoid lack of
vocabulary.