Eureka vs constantan

Eureka and constantan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eureka	Yes	No	No	No
constantan	Yes	No	No	No

As nouns, Eureka and constantan are synonyms defined as:

Eureka and constantan: an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire

Eureka (noun)	constantan (noun)
a town in northwest California on an arm of the Pacific Ocean	an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire
an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire