[Real and Really ]

.Real is an adjective. It modifies only nouns or pronouns

.Really is an adverb. It modifies verbs, adjectives, or other adverbs

.Correct: He stayed at hotels with real class
(.Class is a noun. The adjective modifies it)
.Incorrect: He stayed at a real classy hotel
(.Classy is an adjective. It should be modified by an adverb)
.Correct: He stayed at a really classy hotel
(The adjective classy is modified by the adverb)