Things that are interchangeable can replace each other easily. Interchangeable objects or people can be substituted, and no one would know the difference.

Some things cannot be switched: if you replace spoons with forks, people are going to have trouble eating soup. Other things are interchangeable: if you switch them, nothing will be lost. Gadgets that are interchangeable can be substituted easily: they're exchangeable or standardized. If two workers are interchangeable, they could do each other's jobs. Two interchangeable words mean almost the exact same thing and could be used in the same way. Interchangeable things are versatile, useful — and, most importantly — "switchable."

Definitions of interchangeable
  1. adjective
    capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
    “" interchangeable electric outlets" "interchangeable parts”
    synonyms: exchangeable, similar, standardised, standardized
    capable of being replaced
  2. adjective
    (mathematics, logic) such that the arguments or roles can be interchanged
    “the arguments of the symmetric relation, `is a sister of,' are interchangeable
    symmetric, symmetrical
    having similarity in size, shape, and relative position of corresponding parts
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