homage (demonstration of respect) / homage (formal oath of a vassal to his or her lord) / tribute (act, statement, or gift that is intended to show gratitude, respect, or admiration to a stronger ruler)

(intransitive) to pay homage [+dative = to whom] / (intransitive, literary) to adhere to, uphold [+dative = an idea] / (transitive) to force to surrender, to forcibly make one's vassal

(relational) vassal, tributary

(historical) vassalage, serfdom

(historical) vassal, serf, tributary / (archaic) admirer, enthusiast