O vs air

O and air both are nouns.

Word	Noun	Adjective	Verb	Adverb
O	Yes	No	No	No
air	Yes	No	Yes	No

O (noun)	air (noun)
the blood group whose red cells carry neither the A nor B antigens	travel via aircraft
the 15th letter of the Roman alphabet	a distinctive but intangible quality surrounding a person or thing
a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust	a succession of notes forming a distinctive sequence
	medium for radio and television broadcasting
	the region above the ground
	the mass of air surrounding the Earth
	a slight wind (usually refreshing)
	a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
	once thought to be one of four elements composing the universe (Empedocles), associated with the humour blood

O (verb)	air (verb)
	expose to cool or cold air so as to cool or freshen
	expose to warm or heated air, so as to dry
	make public
	broadcast over the airwaves, as in radio or television
	be broadcast
	expose to fresh air