s.t.p. vs atmosphere

s.t.p. and atmosphere both are nouns.

Word	Noun	Adjective	Verb	Adverb
s.t.p.	Yes	No	No	No
atmosphere	Yes	No	No	No

As nouns, atmosphere is a hypernym of s.t.p.; that is, atmosphere is a word with a broader meaning than s.t.p.:

s.t.p.: standard temperature and pressure
atmosphere: a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade

Other hypernyms of s.t.p. include atm, standard atmosphere, standard pressure, standard temperature.

s.t.p. (noun)	atmosphere (noun)
standard temperature and pressure	a distinctive but intangible quality surrounding a person or thing
	the mass of air surrounding the Earth
	the envelope of gases surrounding any celestial body
	a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
	the weather or climate at some place
	a particular environment or surrounding influence