貢 （コウ） tribute

貢献 （コウケン） contribution (furthering a goal or cause), services (to a cause), paying tribute, tribute

朝貢 （チョウコウ） bringing tribute

幣貢 （ヘイコウ） offering, tribute

貢ぐ （みつぐ） to support (someone) financially, to finance, to supply (money), to give (in support), to present (money or gifts) to a monarch (feudal lord, etc.)