Replaceable and Interchangeable

adjective

• Capable of being replaced. .

• (a.) Capable of being replaced (by) or of being exchanged (for); as, the hydrogen of acids is replaceable by metals or by basic radicals.
• (a.) Capable or admitting of being put back into a place.
• (a.) Admitting of having its place supplied by a like thing or an equivalent; as, the lost book is replaceable.

adjective

• Mathematics, logic. ( such that the arguments or roles can be interchanged)
  • usage: "the arguments of the symmetric relation, `is a sister of,' are interchangeable"
• Capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability.
  • usage: "interchangeable electric outlets" "interchangeable parts"
  • synonyms: exchangeable, similar, standardized, standardised

• (a.) Admitting of exchange or mutual substitution.
• (a.) Following each other in alternate succession; as, the four interchangeable seasons.