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Webster 1913 Edition

Noun.

One who, or that which, makes perfect.

“The . . . perfecter of our faith.”

Barrow.

Noun.

One that makes perfect.

perfecter

perfecter ‎(plural perfecters)

A person who perfects something
- 1980, Various authors, HEBREWS 12:2, The Holy Bible, New International Version:
  fixing our eyes on Jesus, the pioneer and perfecter of faith. For the joy set before him he endured the cross, scorning its shame, and sat down at the right hand of the throne of God.

one who perfects

perfecter