Nouns

(n)nonstop flight, nonstopa flight made without intermediate stops between source and destination“how many nonstops are there to Dallas?”

Adjectives

(s)nonstop(of a journey especially a flight) occurring without stops“a nonstop flight to Atlanta”
(s)around-the-clock, day-and-night, nonstop, round-the-clockat all times“around-the-clock nursing care”

Adverbs

(r)nonstopwithout stopping“we are flying nonstop from New York to Tokyo”