The singular form is passerby; the plural for is passersby.
Passerby
The noun 'passerby' is the singular form. The plural form is passersby.
There are no perfect rhymes for the word passersby.
The possessive form for the plural noun passersby is passersby's.Example: The passersby's attention is not drawn by our display.
The plural form for the compound noun passer-by is passers-by.
What the previous answer said only passerby is singular. A passerby stopped and stared. All of the passersby stopped and stared.
Bacterium is the singular word.
the singular word it is salmon.
singular
The singular word for adenomata is adenoma.
Lance is singular.
singular of the word stitches is stitch.