One Word Substitution Questions in English Grammar

Directions (76): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
The theory or philosophy of law

Directions (77): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
A person who compiles dictionaries         

Directions (78): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
The scientific study of the structure and diseases of teeth            

Directions (80): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
The art of effective or persuasive speaking or writing      

Directions (79): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
One who presents a radio programme    

Directions (81): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
The branch of science concerned with the origin, structure, and composition of rocks      

Directions (82): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
One who study the elections and trends in voting              

Directions (83): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
An artist who makes sculptures.

Directions (84): In questions given below, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
The scientific study of the behavior, structure, physiology, classification, and distribution of animals