-ent creates adjectives, -ence creates nouns.

AdjectiveNoun
abhorrent
absorbent
adjacent
affluent
ambient
ambivalent
apparent
benevolent
competent
coherent
coincident
complacent
confident
consequent
consistent
convenient
corpulent
decadent
deficient
dependent
despondent
deterrent
different
diffident
diligent
efficient
effluent
eloquent
emergent
equivalent
excellent
existent
expedient
flatulent
fluent
fraudulent
imminent
impatient
impudent
inherent
insistent
insolent
insolvent
insurgent
lenient
malevolent
negligent
obedient
omnipotent
omniscient
opulent
penitent
permanent
persistent
pertinent
potent
precedent
prevalent
proficient
prominent
quiescent
recurrent
referent
repellent
resilient
respondent
resurgent
reverent
silent
subsequent
subsistent
succulent
sufficient
truculent
turbulent
urgent
violent
virulent
abhorrence


affluence
ambience
ambivalence

benevolence
competence
coherence
coincidence
complacence
confidence
consequence

convenience
corpulence
decadence
deficience
dependence
despondence
deterrence
difference
diffidence
diligence

effluence
eloquence
emergence
equivalence
excellence
existence
expedience
flatulence

fraudulence
imminence
impatience
impudence

insistence
insolence

insurgence
lenience
malevolence
negligence
obedience
omnipotence
omniscience
opulence
penitence
permanence
persistence
pertinence
potence
precedence
prevalence

prominence
quiescence
recurrence
reference

resilience

resurgence
reverence
silence

subsistence
succulence

truculence
turbulence

violence
virulence