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What are derivations?
Derivational variants are terms which are somehow related to the original term but do not share the same meaning. In linguistics, a derivation derives a new word from an existing word by adding, changing, or removing an non-inflectional affix (prefix or suffix). For example, "unhappy|adj" and "happiness|noun" are derived from "happy|adj" by prefix and suffix, respectively. Derivation typically produces a greater change of meaning from the original form, s more likely to result in a form which has a somewhat idiosyncratic meaning, often changes the (grammatical) category.
In the English language, there are three basic types of derivations (Huddleston, Rodney D., Pullum, Geoffrey K, 2002, The Cambridge Grammar of the English Language PP: 1667):
readable|adj|readability|noun|yes
	modern|adj|modernise|verb|yes
	red|adj|reddish|adj|yes
	slow|adj|slowly|adv|yes
	
star|noun|stardom|noun|yes
	glory|noun|glorify|verb|yes
	recreation|noun|recreational|adj|yes
	
drink|verb|drinkable|adj|yes
	deliver|verb|deliverance|noun|yes
	write|verb|writer|noun|yes
	happy|adj|unhappy|adj|yes
	legal|adj|illegal|adj|yes
	read|verb|reread|verb|yes
	
circle|verb|encircle|verb|yes
	rich|adj|enrich|verb|yes
	large|adj|enlarge|verb|yes
	slave|noun|enslave|verb|yes
	Rapture|noun|enrapture|verb|yes
	green|adj|green|noun|yes
		clean|adj|clean|verb|yes
		
telephone|noun|telephone|verb|yes
		access|noun|access|verb|yes
		host|noun|host|verb|yes
		chair|noun|chair|verb|yes
		gift|noun|gift|verb|yes
		talk|noun|talk|verb|yes
		walk|noun|walk|verb|yes
		google|noun|google|verb|yes