air vs test fly

air is a noun but test fly is not a noun.

Word	Noun	Adjective	Verb	Adverb
air	Yes	No	Yes	No
test fly	No	No	Yes	No

air (noun)	test fly (noun)
travel via aircraft
a distinctive but intangible quality surrounding a person or thing
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

air (verb)	test fly (verb)
expose to cool or cold air so as to cool or freshen	test a plane
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