frazzled "high functioning autism" is not the same thing as Aspergers. Autism is "high functioning" when there is no significant learning disability ie it appears to be distinct from the classic stereotypical highly withdrawn state of "Kanner" autism. I have a 9yo who has severe language disorder and clear learning disabilities, but because he is sociable and does learn (at his own pace and in his own order), he has been described as high functioning.
My bright, superficially articulate 11yo ticks all the boxes for what people would instantly say is "high functioning" autism (although, as other have mentioned, it's not a distinct specified diagnosis in either of the main diagnostic manuals.) His diagnosis, age 3, was Autism, as his language was disordered, at that point - lots of echolalia and jargon, selectively mute and an inability to directly communicate in speech. Being 11 years old and able to tell me all about every bus timetable in NE England (notable,whether I want to know, or not) does not change that initial diagnosis. The only significant change is that he is now described as having atypical autism, as many of his behaviours closely fit the emerging criteria for PDA. He could go to university and end up with a PhD and would still not have his diagnosis changed to Aspergers, because of that speech delay. "High functioning" is such a red herring, as in many ways, he is more disabled than his brother - his superficially more disabled brother who is thriving in mainstream and quite the social butterfly. DS1 hates people. He had an OT visit his special school to do some group work, today. He couldn't engage. I tried to talk to him about it, today and he said that yes, someone had visited but he didn't know them and didn't know why they were there.
Similarly, I have many traits and fit the broader autism phenotype. Were I to warrant a diagnosis, it would possibly be Autism and not Aspergers, as I was selectively mute as a young child. ASD/ASC encompasses both of those diagnoses. It's not a lesser form of autism, any more than AS is.