Part of speech: Noun
a large sea wave
Part of speech: Verb
rise and move, as in waves or billows
Example: The army surged forward
Part of speech: Verb
rise up as if in waves
Example: smoke billowed up into the sky
Part of speech: Verb
move with great difficulty
Example: The soldiers billowed across the muddy riverbed
Part of speech: Verb
become inflated
Example: The sails ballooned