The "phenomena" criterion

People often mis-pluralize the words "phenomenon" and "criterion." These are the singular forms, of course. People often misconstrue the terms, referring to a single event as "the phenomena," for example.

The reason that the distinction is important is that both of these words are common in discussions that require specificity.

When the singular/plural is bungled, credibility becomes suspect in a way that is distractive at best.