Common words:
* Already
* Also
* Always
* Although
* Alter
* Altitude
* Aluminum
* Amazing
* Ambition
* America
* Among
* Another
* Apart
* Appeal
* Around
Less common words:
* Albeit
* Alchemical
* Alienate
* Allot
* Alphabetical
* Altercation
* Altruistic
* Amalgam
* Ameliorate
* Amorous
* Amplify
* Analogous
* Analogy
* Anarchist
* Anesthesia
* Antiquarian
* Aphorism
* Apology
* Appalling
* Aquarium
* Arbitrary
* Archipelago
* Aristocrat
* Armada
* Aromatic
* Artificial
* Ascend
* Ascertain
* Asphalt
* Assail
* Assortment
* Astrology
* Atheist
* Atmosphere
* Atom
* Atrocity
* Attest
* Auction
* Augment
* Aural
* Auxiliary
* Aversion
Technical/scientific words:
* Algorithm
* Alkali
* Allele
* Allergen
* Allometry
* Altimeter
* Alternator
* Alveoli
* Ambient
* Ambulatory
* Anemia
* Antigen
* Antimicrobial
* Antibody
* Aperture
* Apical
* Aquatic
* Arachnid
* Artery
* Artifact
* Asteroid
* Astronaut
* Atmosphere
* Atomic
* Audiology
* Autoimmune
* Automation
* Auxiliary
* Axillary
This is just a small sample of words with the prefix "AL." There are many more, depending on the specific context and field of knowledge you're interested in.