That word representing the fundamental idea.

47. What is the Modifier in a Compound word?

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?