A-ko, B-ko and C-ko

1. abunai- dangerous.The term has a broader application in Japanese than a direct translation would suggest, being employed in situations where an English speaker would say "Duck!" または "Look out!" Another common usage is as a euphemism for "deviant," i.e. a "dangerous" relationship (abunai kankei).
2. ai- love.If a native speaker wanted to specify romantic love, he would use the character pronounced koi (or ren, depending on the context).
3. aite- opponent.Be careful, the word has many applications that are counter-intuitive. A もっと見る literal 読書 of the characters would be "the one whom I must...