airiness vs buoyancy

airiness and buoyancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
airiness	Yes	No	No	No
buoyancy	Yes	No	No	No

As nouns, airiness and buoyancy are synonyms defined as:

airiness and buoyancy: the property of something weightless and insubstantial

airiness (noun)	buoyancy (noun)
the property of something weightless and insubstantial	the property of something weightless and insubstantial
the property of something spacious and abounding in fresh air	irrepressible liveliness and good spirit
lightness in movement or manner	the tendency to float in water or other liquid
	cheerfulness that bubbles to the surface