it is the one in your toilet after you defecate
The insect you are referring to is called a "stink bug."
A brown square thing with four legs is called a table
yes
The insect with a black head and brown body is commonly known as a stag beetle.
The insect you are referring to is likely a cockroach.
yes
cocroach
The insect that is called an anti-social insect is the ant. However, there are times when ants are referred to as social creatures.
an insect in a tooth.
Centipede
Insect sensors are called Antennae.
Imago is what an adult insect is called. Imago is the very last stage of insect metamorphosis.