How do you make words ending in ful into plural?

Words ending in "-ful" form their plurals in the standard way: by adding "-s".

Examples:

* Beautiful -> Beautifuls

* Wonderful -> Wonderfuls

* Careful -> Carefuls

* Meaningful -> Meaningfuls

Note: There are no special rules for pluralizing words ending in "-ful". They follow the general rules for pluralizing nouns in English.