text: Morphological derivation, in linguistics, is the process of forming a new word from an existing word, often by adding a prefix or suffix, such as  For example, unhappy and  happiness derive from the root word happy.
  It is differentiated from inflection, which is the modification of a word to form different grammatical categories without changing its core meaning: determines, determining, and determined are from the root determine.
  Derivational patterns
  Derivational morphology often involves the addition of a derivational suffix or other affix. Such an affix usually applies to words of one lexical category (part of speech) and changes them into words of another such category. For example, one effect of the English derivational suffix -ly is to change an adjective into an adverb (slow → slowly).
  Here are examples of English derivational patterns and their suffixes:
  adjective-to-noun: -ness (slow → slowness)
  adjective-to-verb: -en (weak → weaken)
  adjective-to-adjective: -ish (red → reddish)
  adjective-to-adverb: -ly (personal → personally)
  noun-to-adjective: -al (recreation → recreational)
  noun-to-verb: -fy (glory → glorify)
  verb-to-adjective: -able (drink → drinkable)
  verb-to-noun (abstract): -ance (deliver → deliverance)
  verb-to-noun (agent): -er (write → writer)