to argue with someone, particularly over the ownership of something, facts, etc.
争う
to complain quietly or softly, often in a way that others cannot hear or understand
ぼやく
to spread bad and awful commentaries about someone in order to damage their reputation
中傷する
to criticize or speak unfavorably about someone or something, often in an unfair or unkind way.
悪口を言う
to tell a person that one admires something about them such as achievements, appearance, etc.
褒める
to support or defend something that is believed to be right so it continues to last
支持する
to criticize someone for their actions or behavior, often implying a need for correction
叱責する
to strongly and sincerely state that a particular statement or belief is true
確認する
to confirm or prove the the accuracy, authencity, or effectiveness of something
検証する