Word Formation-Primary Derivatives
Words can be formed by a change of the primary words as when forming nouns from adjectives or verbs, or verbs from nouns or adjectives, etc. Such words formed by making some changes to the spelling of a simple word are called primary derivatives.
Eg: Bond – bind
Here, Bond is a primary derivative formed by making some internal changes the word bind.
The past tense forms which are made by making some internal changes to primary verbs are not usually considered as derivatives.
Nouns from Verbs: allow- allowance, admit – admission, compare- comparison
Nouns from Adjectives: brave-bravery, faithful – faithfulness, honest - honesty
Adjectives from Nouns: Child - Childish, Picture - Picturesque, Earth - Earthen
Verbs from Nouns: Centre – Centralise, Danger – Endanger, Vigour - Invigorate
Verbs from Adjectives: Dense - Condense, Humble - Humiliate, Strange - Estrange