Thank you for your question!
viceless means without vices.(obviously.) “Pure” has many meanings. In Sakar Murlis, it usually means a soul practising celibacy.
In avyakt Murlis, the concept of purity has been extended to pure thoughts, words and deeds. That is the expression of the soul in its “satopradhan” stage.
Therefore, we can say that viceless means pure if we take the avyakt Murli meaning.
If we take the Sakar Murli meaning, “purity” is the absence of sex-lust, which is only one aspect of being viceless.
Thus, we can talk the same language and use the same words but we may not mean the same thing.