Something that can be substituted for something else; a viable replacement.

Capable of being used as a substitute; valid as a replacement or alternate item. / Capable of being substituted.

plural of substitutable

plural of substitution

A replacement or stand-in for something that achieves a similar result or purpose. / (sports) A player who is available to replace another if the need arises, and who may or may not actually do so.

(transitive) To use in place of something else, with the same function. / (transitive, in the phrase "substitute X for Y") To use X in place of Y.

The act of substituting or the state of being substituted. / A substitute or replacement.

simple past tense and past participle of substitute

plural of substitute

Third-person singular simple present indicative form of substitute