Common Words:
* abacus
* abrupt
* absorb
* access
* accuse
* across
* action
* active
* actual
* adapt
* addled
* adored
* adults
* advice
* affair
* agency
* agenda
* agreed
* aisles
* alight
* allied
* allow
* almost
* already
* always
* amaze
* amend
* among
* amount
* ancient
* angels
* angry
* animal
* annual
* answer
* anxiety
* apart
* appeal
* appear
* apple
* apply
* arcade
* around
* arrive
* artist
* asleep
* aspect
* attend
* attract
* avenue
* avoid
* awake
* awaken
* awards
Less Common Words:
* abashed
* abiding
* abolish
* abound
* abroad
* absurd
* accrue
* acquit
* acuity
* adagio
* adjourn
* admire
* adrift
* adroit
* aerosol
* afflict
* afloat
* aghast
* agile
* agony
* alchemy
* alibi
* alienate
* allure
* almond
* alpine
* already
* amends
* amplify
* amused
* analyze
* anchor
* anemic
* annoyed
* antonym
* apathy
* apiece
* aquatic
* archway
* arisen
* aroma
* ascend
* ashore
* askew
* assault
* attain
* audible
* author
* autumn
* avail
* avenge
* awkward
This list is not exhaustive, and there are many other seven-letter words starting with "a" out there!