Fluor,¶ rhymes four, bore, roar.
UP.
Cup, sup, pup, dup,† up.
UPT.
Abrupt, corrupt, interrupt, the participles and preterites of verbs in UP, etc.
UR.
Blur, cur, bur, fur, slur, spur, concur, demur, incur, her, whirr, err, sir, stir, fir, sepulchre, etc.
URB.
Curb, disturb, verb, herb, etc.
URCH.