substitution
[noun]
Synonyms: replacement, change, exchange, swap, switch

[TahlilGaran] English Synonym Dictionary ▲

sub‧sti‧tu‧tion AC /ˌsʌbstəˈtjuːʃən, ˌsʌbstɪˈtjuːʃən $ -ˈtuː-/ noun [uncountable and countable]
[Word Family: noun: substitute, substitution; verb: substitute]
when someone or something is replaced by someone or something else, or the person or thing being replaced:
Coach Ross made two substitutions in the second half.
substitution of something for something
the substitution of English for French as the world’s common language

[TahlilGaran] Dictionary of Contemporary English ▲