The plural of paradox is paradoxes; for example, "There are many paradoxes in this world."

A paradox is a statement that seems contradictory or self-defeating but may express a truth. An example of a paradox is the quote "The only constant is change," which highlights the idea that change is inevitable and always present, even though it may seem contradictory at first glance.

it's at the end of dead-ends-road

paradox = paradoha (however, the English word "paradox" is more common).

"Paradox" is a noun.