Really
Part of speech: adverb
Definition: Actually; in fact; in reality. Very (modifying an adjective); very much (modifying a verb).
Part of speech: interjection
Definition: Indicating surprise at, or requesting confirmation of, some new information; to express skepticism. Indicating affirmation, agreement. Indicating displeasure at another person's behaviour or statement.
Example sentence: The human race has one really effective weapon, and that is laughter.
Truly
Part of speech: adverb
Definition: honestly, truthfully, in fact, indeed, reallyVery.
Example sentence: All things truly wicked start from innocence.