proponent

/pษนษ™หˆpoสŠnษ™nt/
noun
  1. 1

    One who supports something; an advocate

  2. 2

    One who makes a proposal or proposition.

  3. 3

    One who propounds a will for probate.

adjective
  1. 1

    Making proposals; proposing.

Source: https://en.wiktionary.org/wiki/proponent