- Arabian desert
- Arabian Peninsula
- Arabian Sea
- Arabic
- Arabic numeral
- arable
- ARAM
- arbiter
- arbitrary
- arbitrate
- arbitration
- arc
- ARC
- arcade
- arch
- arch-
- archaeological
- archaeologist
- archaeology
- archaic
- archangel
- archbishop
- archduchess
- archduke
- arched
- archenemy
- archeological
- archeology
- archer
- archery
- archetypal
- archetype
- archipelago
- architect
- architectural
- architecture
- archive file
- archives
- archivist
- archway
- ARCM
- Arctic
- Arctic Circle
- Arctic Ocean
- ardent
- ardour
- arduous
- are
- area
- area code
- arena
- aren't
- Argentina
- Argentine
- arguable
- arguably
- argue
- argument
- argumentative
- aria
- arid
- Aries
- arise
- aristocracy
- aristocrat
- aristocratic
- arithmetic
- Arizona
- ark
- Arkansas
- arm
- armada
- armadillo
- Armageddon
- armaments
- armband
- armchair
- armed
- armed forces
- armed robbery
- Armenia
- Armenian
- armhole
- armistice
- armour
- armoured
- armoured car
- armour-plated
- armoury
- armpit
- armrest
- army
- aroma
- aromatherapy
- aromatic
- arose
- around
- arousal
- arouse
- arrange
- arranged marriage
- arrangement
- array
- arrears
- arrest
- arresting
- arrival
- arrive
- arrogance
- arrogant
- arrogantly
- arrow
- arrowroot
- arse
- arsenal
- arsenic
- arson
- arsonist
- art
- art deco
- art gallery
- art nouveau
- artefact
- arterial
- arteriosclerosis
- artery
- artful
- arthritic
- arthritis
- artic
- artichoke
- article
- articled clerk
- articles of association
- articulate
- articulated lorry
- articulation
- artifact
- artifice
- artificial
- artificial insemination
- artificial intelligence
- artificial respiration
- artificially
- artillery
- artisan
- artist
- artiste
- artistic
- artistically
- artistry
- artless
- ARV
- as
- AS
- AS
- AS level
- ASA
- asbestos
- asbestosis
- ascend
- ascendancy
- ascendant
- ascendency
- ascending
- ascension
- Ascension Island
- ascent
- ascertain
- ascetic
- ASCII
- ascorbic acid
- ascribe
- ASCU
- ASE
- aseptic
- asexual
- ash
- ASH
- ash can
- Ash Wednesday
- ashamed
- ashen-faced
- ashore
- ashtray
- Asia
- Asia Minor
- Asian
- Asiatic
- aside
- ask
- askance
- askew
- asking price
- asleep
- ASLEF
- ASM
- asparagus
- ASPCA
- aspect