also: ごきぶり
Common household pest; the word itself is neutral but the insect is generally disliked.
I found a cockroach in the kitchen.
Cockroaches like dark places.
A cockroach appeared in the kitchen in the middle of the night.
I exterminated the cockroach with insecticide.
I swatted the cockroach with a slipper.
If you don't clean, cockroaches will start breeding.