Unfortunately, for you, my friend, there is no plural for could. To make an existing word into a plural, it must be a noun (eg. dog, desk, planet). I, myself, don' exactly understand why such a question would be asked? If you don't mind me asking, why?
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cuffs is the best answer that I could think of
Singular: status Plural: status, statuses So, status could be either singular or plural.
Mail is both singular and plural. You could receive one piece of mail or you could receive lots of mail.
Wild goats is the plural of wild goat. You could have one wild goat (singular) or many wild goats (plural).
The plural is vacuums. (could be vacuum cleaners, or separate situations of a vacuum)