Common Suffixes in English

(Fuente: http://grammar.about.com)

A suffix is a letter or a group of letters attached to the end of a word to form a new word or to alter the grammatical function of the original word. For example, the verb read can be made into the noun reader by adding the suffix -er; read can be made into the adjective readable by adding the suffix -able.
Understanding the meanings of the common suffixes can help us deduce the meanings of new words that we encounter. The table below defines and illustrates 26 common suffixes.

Common Suffixes

Noun Suffixes
Suffix	Meaning	Example
-acy	state or quality	privacy
-al	act or process of	refusal
-ance, -ence	state or quality of	maintenance, eminence
-dom	place or state of being	freedom, kingdom
-er, -or	one who	trainer, protector
-ism	doctrine, belief	communism
-ist	one who	chemist
-ity, -ty	quality of	veracity
-ment	condition of	argument
-ness	state of being	heaviness
-ship	position held	fellowship
-sion, -tion	state of being	concession, transition
Verb Suffixes
-ate	become	eradicate
-en	become	enlighten
-ify, -fy	make or become	terrify
-ize, -ise	become	civilize
Adjective Suffixes
-able, -ible	capable of being	edible, presentable
-al	pertaining to	regional
-esque	reminiscent of	picturesque
-ful	notable for	fanciful
-ic, -ical	pertaining to	musical, mythic
-ious, -ous	characterized by	nutritious, portentous
-ish	having the quality of	fiendish
-ive	having the nature of	creative
-less	without	endless
-y	characterized by	sleazy