Yes - there's an enormous difference. Someone who is respectable is considered by the society they live in as being decent, correct, and worthy of respect. 'Respectful' means that you show respect to other people and to their ideas. Samad, can I offer you some advice? You seem to ask a lot of questions about sets and pairs of words which are very different in meaning. Perhaps you should start using a good English-English learners' dictionary, or check for English-English definitions online? Then, if you still don't see the difference, you could ask us for further explanations.