There is an American wrestler that uses the ring name "Roxxi" but there are no known words accepted by a dictionary that is 5 letters long and ends in xi.
which
bayou
Forum
five (5) letter word ends with Q: tranq. umiaq. qepiq.
Bayeu
adieu, bayou
Shout, about, grout.
Flyer.
Stage
phone
phlox
World.