ingot iron vs atomic number 26

ingot iron and atomic number 26 both are nouns.

Word	Noun	Adjective	Verb	Adverb
ingot iron	Yes	No	No	No
atomic number 26	Yes	No	No	No

As nouns, atomic number 26 is a hypernym of ingot iron; that is, atomic number 26 is a word with a broader meaning than ingot iron:

ingot iron: iron of high purity
atomic number 26: a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood

Other hypernyms of ingot iron include Fe, iron.

ingot iron (noun)	atomic number 26 (noun)
iron of high purity	a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood