1. all, alternative 2. almond, amen (short a) 3. allowed, amend 4. allegory, apple 5. ale 6. ate, asynchronous
Maybe 5 and 6 are the same, but I don't think so.
Do you pronounce these differently? Are there even more leading "a" sounds?
The nature of vowels (as opposed to consonants) is that the vowels can be varied in length (in simple terms, anyway).
Western US, if that matters...