atomic number 74 vs iron manganese tungsten

atomic number 74 and iron manganese tungsten both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 74	Yes	No	No	No
iron manganese tungsten	Yes	No	No	No

atomic number 74 (noun)	iron manganese tungsten (noun)
a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite	a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks