The difference is the index size and generality for me - for instance I can search "lkasdjfai" in Google and it will show me the one time that someone once said

The difference is the index size and generality for me - for instance I can search "lkasdjfai" in Google and it will show me the one time that someone once said that on Flickr. Siri only needs to return a result when it thinks its got a worthwhile result to show, it won't search all documents to find the phrase I want (and returns nothing if I search lkasdjfai, and falls back to Google results). It never even says "siri found no matches for lkasdjfai". I can't use Siri to search for my cousin for instance (I just tried) but with Google he comes up straight away. So for me, a web search is when you are searching any arbitrary phrase and bringing back results for any query, where instant suggestions is an optional response when you think you have a good result.