Show that paracletos means representative.
(2)Show that apostolos doesn't.
The early church identified the Paraclete as the Holy Spirit (Acts 1:5,1:8,2:4,2:38) and Christians continue to use Paraclete as a title for the Spirit of God. In the Gospel of Matthew, chapter 5 v. 4 Jesus Christ uses the verb παρακληθήσονται, paraclethesontai, traditionally interpreted to signify "to be refreshed, encouraged, or comforted". The text may also be translated as vocative as well as the traditional nominative.[ The Orthodox Jewish Brit Chadasha Bible Translation] Then the meaning of 'paraclethesontai', also informative of the meaning of the name, or noun Paraclete, implicates 'are going to summon' or 'will be breaking off'... The Paraclete may thus mean 'the summoner' or 'the one, who, or that which makes free'[http://www.perseus.tufts.edu/hopper/morph?l=paraklhqh%2Fsontai&la=greek&prior=au%29toi\&d=Perseus:text:1999.01.0155:book=Matthew:chapter=5&i=1]
In 1 John 2:1 "Paraclete" is used to describe the intercessory role of Jesus Christ who pleads to The Father on our behalf. And in John 14:16 Jesus says "another Paraclete" will come to help his disciples, implying Jesus is the first and primary Paraclete. [https://secure.wikimedia.org/wikipedia/en/wiki/Paracletos]
Apostolos: a delegate, messenger, one sent forth with orders. [http://www.searchgodsword.org/lex/grk/view.cgi?number=652]
Would you say that all believers are told to be a messenger or one sent forth to spread the gospel?