Merriam-Webster's Collegiate Dictionary:
apple-pie
apple-polish
apple-polisher
applecart
applejack
applesauce
appleseed
applet
appleton
appliance
applicability
applicable
applicant
application
applicative
applicatively
applicator
applicatory
applied
applier
appliqu?
apply
appoggiatura
appoint
appointee
appointive
appointment
apportion
apportionable
apportionment
appose
apposite
appositely
appositeness
apposition
appositional
appositive
appositively
appraisal
appraise
appraisee
appraisement
appraiser
appraisingly
appraisive
appreciable
appreciably
appreciate
appreciation
appreciative
appreciatively
appreciativeness
appreciator
appreciatory
apprehend
apprehensible
apprehensibly
apprehension
apprehensive
apprehensively
apprehensiveness
apprentice
apprenticeship
appressed
appressorium
apprise
apprize
appro
approach
approachability
approachable
approbate
approbation
approbatory
appropriable
appropriate
appropriately
appropriateness
appropriation
appropriative
appropriator
approvable
approvably
approval
approve
approved school
approvingly
approx
approximate
approximately
approximation
approximative
appt
apptd
appurtenance
appurtenant
apr
