If the word ends in silent e , drop the e and add the suffix, unless the final e is needed to preserve the sound of the preceding consonant.
Which spelling word requires the final e to preserve the sound of the consonant before it?

acceptance
agreeing expressly or by conduct to the act or offer of another

alliance
a pact or confederation between nations or groups

attendance
the act of being present

condense
to reduce the volume of; compress

condolence
an expression of sympathy

conference
a meeting of two or more people

defense
the act of resisting attack, danger, or injury

existence
the fact or state of being, living

expense
financial obligation or outlay

experience
direct observation or participation in events; the knowledge, skills, emotions, and feelings of having participated in events

grievance
a real or supposed situation that is regarded as just cause for complaint or resistance

immense
great in size; huge

intelligence
the capacity to acquire and apply knowledge

intense
extreme in degree; very strong, fervent, or deep

interference
something that hinders or obstructs

nonsense
language, behavior or ideas that are absurd

occurrence
something that takes place; an incident

perseverance
steadfastness; persistence

remembrance
the act of remembering; an item or celebration that calls to memory a person, place or event

repentance
regret or contrition for things done wrong

resemblance
similarity in nature or form

resistance
the act or ability to resist; opposition

superintendence
giving direction or supervision

vengeance
the act of punishing another in payment for a wrong

vigilance
the state of being watchful, avoiding danger