Both Uses

deception
in
Home, by Anton Chekhov
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It's not normal....It's falsification ...deception ...tricks ....†

deception = the act of lying to or misleading someone; or something that misleads
Medicine should be sweet, truth beautiful, and man has had this foolish habit since the days of Adam ...though, indeed, perhaps it is all natural, and ought to be so....There are many deceptions and delusions in nature that serve a purpose.†
*

deceptions = instances of intentionally misleading; or things done to mislead

Definitions:

(1) (deception)
the act of lying to or misleading someone; or something that misleads
(2) (meaning too rare to warrant focus)