The plural of board is boards.
The plural version of bat is bats.
Bills of health is the plural
Suppers is the plural version of supper.
It is peninsulas
In the sense of "toast," health could be pluralized, as in "We drank so many healths we got sick." Otherwise, it has no plural.
The plural of board is boards. As in "we looked at the drawing boards".
pixaxe is the singular version, pickaxes is the plural version.
Bills of health is the plural
Health is an uncountable noun and has no plural.
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."
Boards.