Categories of Derivational suffixes

Derivational suffix categories:

    Derivational suffixes are widely classified into two types: class-maintaining and class-changing.

(a) Maintaining the class: 

    These suffixes generate a derived form of the same kind as the underlying form. They do not alter the classification of a portion of the speech. Here are a few such examples:

- Maintaining Suffix	Suffix	Word	Class	New word	Class
	-ship	friend	noun	friendship	Noun

	ess-	tiger	noun	tigress	Noun
	ite	Hindu	adjective	Hinduite	adjective

(b) Class-changing Suffixes:

These suffixes produce a derived form  of another class. Here are a few examples:

Class-Changing Suffixes	Class Change	Suffix	Word	Class	New word	Class
	Noun to adjective	-ian	India	noun	Indian	Adjective
	Adjectives to Noun	) -ity	able	adjective	ability	Noun
	Nouns to Verbs	-ify	fort	noun	fortify	Verb
	Verbs to Nouns	-er	drive	verb	driver	Noun
	Verbs to Adverb	-fly	sleep	verb	sleepily	Adverb
	Adjectives to Adverbs	-ly	nice	adjective	nicely	adverb