Synonyms for When:
at, while, During, meanwhile, at the same time.
n.at the same time, concurrent, all the time, If, together, even as, simultaneous. before, all, sometime, Until, This, here, then, last, Whenever. how, just, where has someone/something gotten to?, do with, what (has) happened to something, anyway, kindly, what has/will become of, what's gotten into someone?, keep. •when (noun)