hot-air balloon (noun) hot-air balloon: lighter-than air craft
Sinonime: alto, baritone, bass, booming, contralto,
dark,
extreme, full-toned,
grave,
great,
hard, low, low-pitched, low-toned,
profound,
resonant,
rich,
sonorous,
strong,
vividAntonime: light,
pale,
quiet,
soft