Substitute
Definition 1 of 4

Temporary Replacement
Refers to someone who takes a place for a short time, not permanently.

Sara was a substitute teacher for just one week.
Not Identical
The substitute might be similar but not exactly the same as what it replaces.

Almond milk can be a good substitute for cow's milk in recipes.
Plan B
A substitute often acts as a backup option when the original is unavailable.

An in-class assignment was the substitute for the canceled field trip.
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