15 letters · 23 points in Scrabble
adjective (mathematics, logic) such that the arguments or roles can be interchanged
adjective capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
originEtymology tree English interchange Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English interchangeable From interchange + -able.
Etymology from Wiktionary, CC BY-SA 3.0