Roget’s II: The New Thesaurus, Third Edition. 1995.

bubble
NOUN: A fantastic, impracticable plan or desire: castle in the air, chimera, dream, fantasy, illusion, pipe dream, rainbow.

VERB: 1. To be in a state of emotional or mental turmoil: boil, burn, churn, ferment, seethe, simmer, smolder.

2. To form or cause to form foam: cream, effervesce, fizz, foam, froth, lather, spume, suds, yeast.

3. To flow or move with a low slapping sound: burble, gurgle, lap, splash, swash, wash.