meltdown vs nuclear meltdown

meltdown and nuclear meltdown both are nouns.

Word	Noun	Adjective	Verb	Adverb
meltdown	Yes	No	No	No
nuclear meltdown	Yes	No	No	No

As nouns, meltdown and nuclear meltdown are synonyms defined as:

meltdown and nuclear meltdown: severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping

meltdown (noun)	nuclear meltdown (noun)
a disaster comparable to a nuclear meltdown	severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping