Here are the possible solutions for rats and cockroaches clue
Answer
Clue
Relevancy
vermin
Clue
Rats and cockroaches
insects
Clue
Cockroaches and cicadas, e.g.
Crickets and cockroaches, for example
Definition
INSECT, a word loosely used for a small invertebrate creature, esp. one with a body divided into sections; in zoological terms, a member of the Insecta
hissers
Clue
Exotic cockroaches from Madagascar, so named for the sound they produce