Not every A word in English — 170 with definitions. The ones that look hard usually start with a Latin prefix: ad- (toward), ab- (away), anti- (against).
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Once you see the prefix, words like abstruse and anachronism stop being a wall of letters.
This page is 170 words with definitions, not a dump of the dictionary. The I page is bigger because that list picked up a lot of in- words. In a real dictionary S still starts more English words than A.
No. English has thousands of A words. This is 170 entries with definitions for the generator, not a dictionary dump.