pdq

[shonna]

four letters starts with A

[Clanad]

ASAP (As Soon As Possible)...

[don1]

aahs aals abas abba abbe abed abet able ably abos abri abut abye abys aced aces ache achy acid acme acne acre acta acts acyl adds adit ados adze aeon aero aery afar agar agas aged agee ager ages agha agin agio agly agma agog agon ague ahem ahoy aide aids ails aims ains airn airs airt airy aits ajar ajee akee akin alae alan alar alas alba albs alec alee alef ales alfa alga alif alit alky alls ally alma alme alms aloe alow alps also alto alts alum amah amas ambo amen amia amid amie amin amir amis ammo amok amps amus amyl anal anas ands anes anew anga anil anis ankh anna anoa anon ansa anta ante anti ants anus aped aper apes apex apod apse aqua arak arbs arch arco arcs area ares arfs aria arid aril arks arms army arse arts arty arum arvo aryl asci asea ashy asks asps atap ates atma atom atop auks auld aunt aura auto aver aves avid avos avow away awed awee awes awls awns awny awol awry axal axed axel axes axil axis axle axon ayah ayes ayin azan azon

Could you narrow it down a bit shonna, you know like a clue?