Both Uses

phenomenon
in
Rosencrantz and Guildenstern Are Dead
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GUIL: The scientific approach to the examination of phenomena is a defence against the pure emotion of fear.†
Act 1 *

phenomena = things that exists or happened -- often of special interest
Ninety-two coins spun consecutively have come down heads ninety-two consecutive times ...and for the last three minutes on the wind of a windless day I have heard the sound of drums and flute.... ROS (cutting his fingernails): Another curious scientific phenomenon is the fact that the fingernails grow after death, as does the beard.†
Act 1

phenomenon = something that exists or happened -- often of special interest

Definitions:

(1) (phenomenon)
something that exists or happened -- especially something of special interest -- sometimes someone or something that is extraordinary

"Phenomenons" and "phenomena" are both appropriate plural forms of this noun. "Phenomena" is generally used in scientific or philosophical contexts.
(2) (meaning too rare to warrant focus)
In philosophy, a phenomenon is something as known through the senses. It is contrasted with a noumenon.