It is peninsulas
The plural version of bat is bats.
Suppers is the plural version of supper.
The plural of board is boards.
The plural form for the noun cliff is cliffs.Examples:We walked along the cliffs watching sailboats against the sky.Three Cliffs Bay, Gower Peninsula, Wales
'Multiple' is a singular word in its own right. 'Multiples' is the plural word. NOT 'multiplies' , this is a mathematical operation.
pixaxe is the singular version, pickaxes is the plural version.
The plural of googol is googols.
The plural version of bat is bats.
Suppers is the plural version of supper.
ounce is the singular version and ounces is plural.
The plural of "glass" is "glasses."
These.
The plural of "aula" is "aulas."
dashes
Feet .
enemies
Mysteries