Merriam-Webster's Collegiate Dictionary:
ascendency
ascendent
ascender
ascendible
ascending
ascension
ascension day
ascensional
ascensive
ascent
ascertain
ascertainable
ascertainment
ascesis
ascetic
ascetical
ascetically
asceticism
asch
ascham
ascidian
ascii
ascites
ascitic
asclepiad
asco-
ascocarp
ascocarpic
ascogonium
ascoli piceno
ascoli satriano
ascomycete
ascomycetous
ascorbate
ascorbic acid
ascospore
ascosporic
ascot
ascribable
ascribe
ascribed
ascription
ascriptive
asculum apulum
asculum picenum
ascus
ascutney, mount
asdic
ase
asean
asepsis
aseptic
aseptically
asexual
asexuality
asexually
asgard
asgd
asgmt
ash
ash can
ash shariqah
ash wednesday
ash-blond
ash-blonde
ashamed
ashamedly
ashanti
ashburton
ashcan
ashcroft
ashdod
ashe
ashen
asher
asheville
ashfall
ashgabat
ashkenazi
ashkenazic
ashkhabad
ashlar
ashless
ashley
ashore
ashqelon
ashram
ashton
ashtoreth
ashtray
ashur
ashurbanipal
ashy
asi
asia
asia minor
asiago
