Greenwich Time vs Greenwich Mean Time

Greenwich Time and Greenwich Mean Time both are nouns.

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

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

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

Other synonyms of Greenwich Time include GMT, universal time, UT1, UT.

Greenwich Time (noun)	Greenwich Mean 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