Difference btn a stabilizer and a regulator.

This sounds like a homework problem. You really should not be asking anyone to do your homework for you. You don't learn anything that way. I suggest you start by using Google and Wikipedia:

Type in the keywords "voltage stabilizer" or "voltage regulator" and read through the results. The answer should be in the first few articles. If you don't understand the articles, read the textbook or ask the instructor.

Also, advantages and disadvantages are comparisons. When you ask a question about the advantages and disadvantages of something, you need to specify with what you are comparing.