What are the most common words starting with A?

It's impossible to definitively say which words starting with "A" are the *most* common, as that depends heavily on context (e.g., spoken language vs. written text, specific genre, etc.). However, here are some very common words beginning with "A" in general English usage:

High-frequency words:

* a: (the indefinite article)

* and: (conjunction)

* are: (verb)

* about: (preposition/adverb)

* as: (conjunction/adverb)

* at: (preposition)

* all: (determiner/pronoun/adverb)

* an: (the indefinite article)

* after: (preposition/adverb)

* again: (adverb)

* also: (adverb)

* always: (adverb)

Other common words:

* across: (preposition/adverb)

* actually: (adverb)

* add: (verb)

* agree: (verb)

* almost: (adverb)

* along: (preposition/adverb)

* already: (adverb)

* another: (determiner/pronoun)

* any: (determiner/pronoun)

* around: (preposition/adverb)

* ask: (verb)

This is just a starting point. The specific "most common" words will vary depending on the context you're considering.