Other hyponyms of hap include
break,
develop,
recrudesce,
arise,
come up,
result,
intervene,
transpire,
give,
supervene,
go,
proceed,
come,
fall,
anticipate,
develop,
recur,
repeat,
come off,
go off,
go over,
come around,
roll around,
happen,
materialise,
materialize,
bechance,
befall,
happen,
bechance,
befall,
betide,
coincide,
backfire,
backlash,
recoil,
chance,
break,
fall,
shine,
strike,
turn out,
contemporise,
contemporize,
synchronise,
synchronize.