告訴 (こくそ) means "accusation, charge, or complaint," specifically in criminal law. Both `告` (コク) and `訴` (ソ) are standard On'yomi readings. `告` means to inform or announce, and `訴` means to appeal or sue. The compound refers to filing a criminal complaint. Misreadings like `こくそう` misinterpret `訴` as `ソウ`, while `こくそん` and `こそ` are phonetic errors or misreadings of `告` or `訴`.

告訴 (こくそ) は「犯罪事実を捜査機関に申し立て、処罰を求めること」を意味します。「告」（コク）も「訴」（ソ）も標準的な音読みです。誤読の「こくそう」は「訴」の読み間違いで、「こくそん」や「こそ」は「告」や「訴」の音の誤りです。