相互【そうご】
mutual, reciprocal
互い【たがい】
each other, one another
互いに【たがいに】
mutually, with each other, reciprocally, together
交互【こうご】
alternate, alternating, mutual, reciprocal
互助【ごじょ】
mutual aid, cooperation, benefit
互選【ごせん】
election by mutual vote, election from within a committee (party, etc.), internal vote