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"Cuarto" is an adjective which is often translated as "fourth", and "habitación" is a noun which is often translated as "room". Learn more about the difference between "cuarto" and "habitación" below.
cuarto, el cuarto()
An adjective is a word that describes a noun (e.g., the big dog).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
la habitación()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
