It is a normal S plural, worms.
The word 'worms' is the plural form for the singular noun worm.
The plural is hooves.
The plural is cherries.
The plural is cantaloupes.
The plural is resources.
The plural is roses.
The plural is "emeralds."
The plural way to spell studio is studios.
The plural of bird is birds. As in "the birds chased the worm".
The plural is bridges.
Trout is plural
The plural of beach is beaches.