time of arrival vs arrival time

time of arrival and arrival time both are nouns.

Word	Noun	Adjective	Verb	Adverb
time of arrival	Yes	No	No	No
arrival time	Yes	No	No	No

As nouns, time of arrival and arrival time are synonyms defined as:

time of arrival and arrival time: the time at which a public conveyance is scheduled to arrive at a given destination

time of arrival (noun)	arrival time (noun)
the time at which a public conveyance is scheduled to arrive at a given destination	the time at which a public conveyance is scheduled to arrive at a given destination