災難 (さいなん) combines 災 (calamity) and 難 (difficulty). Both are on'yomi readings, common for abstract noun compounds. ざいなん is incorrect as 災 is read さい here; さいらん and さいだん misread 難, which is なん. It denotes an unforeseen, unwelcome event or misfortune, like a disaster or personal trouble.
災難(さいなん)は「災(わざわい)」と「難(むずかしい)」の組み合わせで、両方とも音読みです。ざいなんは「災」の読み間違い、さいらん・さいだんは「難」の読み間違いです。予期せぬ不幸な出来事や災害を意味します。
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