terminus a quo vs starting time

terminus a quo and starting time both are nouns.

Word	Noun	Adjective	Verb	Adverb
terminus a quo	Yes	No	No	No
starting time	Yes	No	No	No

As nouns, starting time is a hypernym of terminus a quo; that is, starting time is a word with a broader meaning than terminus a quo:

Other hypernyms of terminus a quo include beginning, commencement, first, get-go, kickoff, offset, outset, showtime, start.

terminus a quo (noun)	starting time (noun)
earliest limiting point	the time at which something is supposed to begin