That word which describes the other.

48. _What is the Base of a Derivative word?_
The primitive from which it is derived.

49. _What is the Modifier in a Derivative word?_
The affix.

50. _What is an Affix?_
That part of a derivative word attached to the root.

51. _How many Root words in the English language?_
Over one thousand.

52. _What is a Prefix?_
That part of a derivative word placed before the root.

53. _What is a Postfix?_
That part of a derivative word placed after the root.

54. _What is a Suffix?_
Same as a postfix.

55. _What are Affixes?_
Prefixes and postfixes together are called affixes.

56. _How many kinds of Derivatives are there?_
Two.

57. _What are they?_