air vs breath

air and breath both are nouns.

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

As nouns, breath is a hyponym of air; that is, breath is a word with a more specific, narrower meaning than air:

As nouns, breath is a hyponym of air; that is, breath is a word with a more specific, narrower meaning than air:

air: a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
breath: the air that is inhaled and exhaled in respiration

Other hyponyms of air include hot air, liquid air.

air (noun)	breath (noun)
travel via aircraft	the process of taking in and expelling air during breathing
a distinctive but intangible quality surrounding a person or thing	an indirect suggestion
a succession of notes forming a distinctive sequence	a slight movement of the air
medium for radio and television broadcasting	the air that is inhaled and exhaled in respiration
the region above the ground	a short respite
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)	breath (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