constantan vs Eureka

constantan and Eureka both are nouns.

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

As nouns, constantan and Eureka are synonyms defined as:

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

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