2 Answers

the phrase "living vicariously through someone else" means to enjoy exciting experiences that you are unable to have yourself by listening to someone else describe their experiences to you. For example, say you are married and can't go out and party anymore, but you have a bachelor friend that goes out clubbing, meets women, and has crazy times. You can experience those things (live vicariously) second-hand by listening to your friend tell you all about his experiences that you can't have (but would like to)....

It depends on how you wish to use the word ..

Apparently VICARIOUSLY is exactly the word you were looking for in your other question.  I think "SUBSTITUTE" might be the best synonym.