spanner in the works

noun 0.862

wrench

noun 0.704

monkey wrench

noun 0.654

fly in the ointment

noun 0.629

wrenching

noun 0.621

disruption

noun 0.575

spanner

noun 0.575

haywire

noun 0.570

mess-up

noun 0.569

troublemaker

noun 0.562

sticky wicket

noun 0.561

unworkable

noun 0.554

hindrance

noun 0.550

inconvenience

noun 0.549

disrupter

noun 0.548

workaround

noun 0.542

screwup

noun 0.539

contretemps

noun 0.536

train wreck

noun 0.530

troubler

noun 0.528

sabotage

noun 0.524

trouble

noun 0.524

hassle

noun 0.521

roadblock

noun 0.521

troublemaking

noun 0.521

destabilizer

noun 0.517

tough nut to crack

noun 0.517

obstacle

noun 0.515

upsetting

noun 0.514

pipe wrench

noun 0.512

unexpected

noun 0.512

mix up

noun 0.511

can of worms

noun 0.511

interference

noun 0.510

disturber

noun 0.510

adjustable wrench

noun 0.509

interfering

noun 0.509

impediment

noun 0.508

pain in the butt

noun 0.508

bother

noun 0.507

perturbation

noun 0.507

work in progress

noun 0.505

wreck

noun 0.504

obstruction

noun 0.504

problematic

noun 0.503

pain in the arse

noun 0.502

screw

noun 0.502

working order

noun 0.501

upset

noun 0.501