[tlhIngan Hol] "rookie" vs "veteran"

I am trying to find a pair of relatively simple words that I can use to label people as the equivalent of rookies (it's their first time experiencing something) or veterans (they've been through it before). I like {chu'wI'} "newcomer", but I can't decide what to use as its counterpart. Have any of you ever needed this kind of distinction, and if so, did you come up with anything satisfactory? -- ghunchu'wI'