- alkaloid
- alkane
- alkene
- alkie
- all-
- all
- All Black
- all clear
- All Fools' Day
- all fours
- all out
- all right
- all round
- All Saints' Day
- All Souls' Day
- all square
- all told
- Allah
- all-American
- all-around
- allay
- all-comers
- all-consuming
- all-day
- allegation
- allege
- alleged
- allegedly
- allegiance
- allegorical
- allegorically
- allegory
- allele
- alleluia
- all-embracing
- Allen key
- allergen
- allergenic
- allergic
- allergist
- allergy
- alleviate
- alleviation
- all-expenses-paid
- alley
- alley cat
- alleyway
- all-fired
- Allhallows
- alliance
- allied
- alligator
- all-important
- all-in
- all-in wrestling
- all-inclusive
- all-in-one
- alliteration
- alliterative
- all-night
- all-nighter
- allocate
- allocation
- allomorph
- allomotry
- allopathic
- allopathy
- allophone
- allot
- allotment
- allotrope
- allotropy
- allover
- allow
- allowable
- allowance
- alloy
- all-party committee
- all-party talks
- all-points bulletin
- all-powerful
- all-purpose
- all-round
- all-rounder
- all-seater
- all-singing all-dancing
- allspice
- all-star
- all-terrain bike
- all-terrain vehicle
- all-time
- allude
- allure
- alluring
- allusion
- allusive
- allusively
- alluvial
- alluvium
- all-weather
- ally
- Alma Mater
- almanac
- almighty
- almond
- almond paste
- almoner
- almost
- alms
- almshouse
- aloe
- aloft
- aloha shirt
- alone
- along
- alongshore
- alongside
- aloof
- aloofness
- alopecia
- aloud
- alp
- alpaca
- alpenhorn
- alpenstock
- alpha
- alpha girl
- alpha male
- alpha particle
- alpha pup
- alpha ray
- alpha wave
- alphabet
- alphabetical
- alphabetically
- alphabetize
- alphameric
- alphanumeric
- alpine
- alpinist
- Alps
- al-Qaeda
- already
- alright
- Alsace
- Alsatian
- also
- also-ran
- alt key
- Alta.
- altar
- altarpiece
- alter
- alter ego
- alteration
- altercation
- alterglobalism
- alterglobalist
- alternate
- alternately
- alternating
- alternating current
- alternation
- alternative
- alternatively
- alternator
- although
- altimeter
- altitude
- alto
- altocumulus
- altogether
- altostratus
- altruism
- altruist
- altruistic
- alum
- aluminium
- alumna
- alumnus
- alveolar
- alveolus
- always
- always-on
- alyssum
- Alzheimer's
- Alzheimer's disease
- a.m.
- AM
- AMA
- amalgam
- amalgamate
- amalgamation
- amanuensis
- amaranth
- amaryllis
- amass
- amateur
- amateurish
- amateurism