• audiobook,
• audiobooks,
• zudio book,
• sudio book,
• wudio book,
• qudio book,
• aydio book,
• ahdio book,
• ajdio book,
• aidio book,
• a8dio book,
• a7dio book,
• ausio book,
• auxio book,
• aucio book,
• aufio book,
• aurio book,
• aueio book,
• auduo book,
• audjo book

The adjective form of the word "audio book" is "audiobook".

The plural of the "audio book" can be the "audio books".

The singular of the "audio book" can be the "audio book".