Comparative form of complete: more complete(adjective)
One who completes something.(noun)
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Use "completer" in a sentence
"Academy officials credit stepped-up recruitment efforts, including a new "completer" program, which helps prospective academy students, especially minorities, follow through with their applications."
"There will also be a set of six different scene pins offered separately or together, with a packaged and framed sets including "completer" AT-AT/snowspeeder and Yoda 30th pins."
"For those who have already purchased Sue Thomas: F. B.Eye - Volume 1 prior to May 1st (it's been available since last November), you are eligible to purchase a special "completer" set of"