• passerbys,
• passerbyer,
• passerbye,
• -passer-by,
• oasserby,
• lasserby,
• -asserby,
• paseerby,
• passeeby,
• passeerby,
• passeby,
• passerb,
• passarby,
• passerbi,
• passerinna,
• passerini,
• passeroo,
• padseoy,
• Vasselry,
• -passersby

• passer-by.

The adjective form of the word "passerby" is "passing".

The plural form of the word "passerby" is "passersby"

The singular form of the word "passerby" is "passerby". The term does not change form in the singular.