Substitutable
Part of speech: adjective
Definition: Capable of being used as a substitute, valid as a replacement or alternate item. Capable of being substituted.
Synonymous
Part of speech: adjective
Definition: having a similar meaningof, or being a synonym
Example sentence: Elegance is usually confused with superficiality, fashion, lack of depth. This is a serious mistake: human beings need to have elegance in their actions and in their posture because this word is synonymous with good taste, amiability, equilibrium and harmony.