dream vs revery

dream and revery both are nouns.

Word	Noun	Adjective	Verb	Adverb
dream	Yes	No	Yes	No
revery	Yes	No	No	No

As nouns, revery is a hyponym of dream; that is, revery is a word with a more specific, narrower meaning than dream:

As nouns, revery is a hypernym of dream; that is, revery is a word with a broader meaning than dream:

dream: a state of mind characterized by abstraction and release from reality
revery: an abstracted state of absorption

Other hypernyms of dream include reverie.

dream (noun)	revery (noun)
a series of mental images and emotions occurring during sleep	an abstracted state of absorption
imaginative thoughts indulged in while awake	absentminded dreaming while awake
a fantastic but vain hope (from fantasies induced by the opium pipe)
a state of mind characterized by abstraction and release from reality
a cherished desire
someone or something wonderful

dream (verb)	revery (verb)
have a daydream; indulge in a fantasy
experience while sleeping