Nichrome vs nickel alloy

Nichrome and nickel alloy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nichrome	Yes	No	No	No
nickel alloy	Yes	No	No	No

As nouns, nickel alloy is a hypernym of Nichrome; that is, nickel alloy is a word with a broader meaning than Nichrome:

Nichrome: an alloy of nickel and chromium with high electrical resistance and an ability to withstand high temperatures; used for resistance heating elements
nickel alloy: an alloy whose main constituent is nickel

Other hypernyms of Nichrome include nickel-base alloy.

Nichrome (noun)	nickel alloy (noun)
an alloy of nickel and chromium with high electrical resistance and an ability to withstand high temperatures; used for resistance heating elements	an alloy whose main constituent is nickel