hot air balloon (noun) hot-air balloon: lighter-than air craft
Sinonime: basal, basic,
central,
chief, constitutive,
essential,
first,
foremost, fundamental, greatest,
highest,
indispensable,
leading, main, overriding, overruling,
paramount,
pivotal,
preeminent,
primary,
prime,
principal, ruling, vital
Antonime: inessential,
insignificant,
minor,
negligible,
secondary,
unimportant