Greenwich Mean Time vs universal time

Greenwich Mean Time and universal time both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greenwich Mean Time	Yes	No	No	No
universal time	Yes	No	No	No

As nouns, Greenwich Mean Time and universal time are synonyms defined as:

Greenwich Mean Time and universal time: the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere

Other synonyms of Greenwich Mean Time include GMT, Greenwich Time, UT1, UT.

Greenwich Mean Time (noun)	universal time (noun)
the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere	the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere