お互い【おたがい】
each other, one another
互い【たがい】
each other, one another
相互【そうご】
mutual, reciprocal
互角【ごかく】
equal (in ability), even, evenly matched, well-matched, on par (with)
交互【こうご】
alternate, alternating, mutual, reciprocal
互換【ごかん】
interchange, transposition, compatible (e.g. PC)
相互銀行【そうごぎんこう】
mutual savings bank
互助【ごじょ】
mutual aid, cooperation, benefit
相互作用【そうごさよう】
interaction
互いに【たがいに】
mutually, with each other, reciprocally, together
互選【ごせん】
election by mutual vote, election from within a committee (party, etc.), internal vote
お互いに【おたがいに】
mutually, with each other, reciprocally, together, both