morning time vs morn

morning time and morn both are nouns.

Word	Noun	Adjective	Verb	Adverb
morning time	Yes	No	No	No
morn	Yes	No	No	No

As nouns, morning time and morn are synonyms defined as:

Other synonyms of morning time include forenoon, morning.

morning time (noun)	morn (noun)
the time period between dawn and noon	the time period between dawn and noon