One that exterminates, especially one whose occupation is the extermination of vermin.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "exterminator" in a sentence
"Her husband wouldn't let her call an exterminator."
"The rat ran for its life, dog barely missed it and I called the exterminator who came that afternoon and got rid of it."
"Not sure how they got in, I called my exterminator and had my house checked."