instantly vs right away

instantly and right away both are adverbs.

Word	Noun	Adjective	Verb	Adverb
instantly	No	No	No	Yes
right away	No	No	No	Yes

As adverbs, instantly and right away are synonyms defined as:

instantly and right away: without delay or hesitation; with no time intervening

Other synonyms of instantly include at once, directly, forthwith, immediately, like a shot, now, straight off, straightaway.

instantly (adverb)	right away (adverb)
without delay or hesitation; with no time intervening	without delay or hesitation; with no time intervening
without any delay	at once (usually modifies an undesirable occurrence)