Difference between Instantly and Immediately

INSTANTLY vs IMMEDIATELY: ADVERB

Without delay or hesitation; with no time intervening
Near or close by
Bearing an immediate relation
Without delay.
Without an intermediary; directly.
In an immediate manner; without intervention of any other person or thing; proximately; directly; -- opposed to mediately.
Without interval of time; without delay; promptly; instantly; at once.
As soon as. Cf. Directly, 8, Note.
In an immediate manner; instantly or without delay.

As soon as; directly.
Indicates that the dependent clause describes something that occurs immediately after the independent clause's referent does.

With no time intervening
Without delay or hesitation
Synonyms Instantaneously, promptly, forthwith, straightway.
Without lapse of time; without delay; instantly.
In an immediate manner; without the intervention of anything; proximately; directly.

Instantaneous, Automatically, Quickly, Instant, In a flash, At once, Outright, Right away, In real time, Now, Straightaway, Forthwith, Directly, Immediately, Instantaneously

Swiftly, Instantaneously, Immediate, Soon, Quickly, Shortly, Promptly, In real time, At once, Right away, Straightaway, Now, Directly, Forthwith, Instantly

Momentarily, Suddenly, Effortlessly, Straight, Overnight, Readily, Instantaneous, Automatically, Quickly, Instant, Outright, Now, Straightaway, Forthwith, Immediately

Thereupon, Suddenly, Upon, Once, Readily, Automatically, Then, Swiftly, Immediate, Soon, Quickly, Shortly, Straightaway, Now, Forthwith

This form must be provided immediately upon termination.
She does not immediately report to the police.
The enrolling school will immediately contact the school last attended to obtain education records, and the sending school will immediately transfer those records.
Gil was the only available Notary who answered my call immediately, and he was available immediately, and around the corner from my office.
This showed that zones immediately around licensed premises had more assaults compared with zones immediately around commercial premises.
Land which is immediately adjacent to the current city limits, and for which there is sewer and water service immediately available.
Change password immediately if it is suspected to have been compromised and report the incident to your supervisor or IT support personnel immediately.
Rather than plunging immediately into combies enter the city and immediately visit the house of a prostitute, Rahab.
These commands are effective immediately and their log messages are also displayed immediately.
Sick leave begins to accrue immediately and can be used immediately.