Types of Master's Degree in Mechanical Engineering are -
1. Acoustical Engineering
2. Aerospace Engineering
3. Manufacturing Engineering
4. Marine Engineering
5. Mechatronics
6. Master in Industrial Mechanical Engineering
7. Master of Engineering in Additive Manufacturing
8. Mechanics of Materials and Structures
9. Spatial Engneering
10. Masters Programme in Mechanical Engineering with    
      Emphasis on Structural Engineering

Hi Rohith,

These are some of the specializations you could opt to choose while pursuing your masters in Mechanical Engineering(M.S,M.Tech,M.E)

Thermal and Fluids Engineering

Design Engineering, 

Manufacturing Engineering.

Mechanical Design

Manufacturing and Precision Engineering

Thermal Engineering

Nanotechnology

Automotive Engineering

Automotive Electronics

These are just some of the courses in which you could specialize on

Find where your interests lie and choose the specialization