substituting

noun

1. a person or thing serving or used in place of another
2. Gram. any word or word group, as a pronoun, the verb to do, etc., used in place of another word or words (Ex.: did for shouted in “she shouted and he did, too”)

transitive verb substituted, substituting

1. to put or use in place of another
2. Now Rare to take the place of
3. Chem. to replace as a substituent

intransitive verb

adjective