buoyancy vs airiness

buoyancy and airiness both are nouns.

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

As nouns, buoyancy and airiness are synonyms defined as:

buoyancy and airiness: the property of something weightless and insubstantial

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