• dunny book,
• cunny book,
• vunny book,
• gunny book,
• tunny book,
• runny book,
• fynny book,
• fhnny book,
• fjnny book,
• finny book,
• f8nny book,
• f7nny book,
• fubny book,
• fumny book,
• fujny book,
• fuhny book,
• funby book,
• funmy book,
• funjy book,
• funhy book

The adjective form of "funny book" is "funny".

The plural form of the word "funny book" is "funny books"

The singular form of the word "funny book" is "funny book".