All bugs are insects, but not all insects are bugs.
Animal Facts

All bugs are insects, but not all insects are bugs.

Strictly speaking, "bugs" are an order of insects called Hemiptera. "True Bugs" as entomologiss also call them, are insects that have hypodermic-needle-like mouthparts

All bugs are insects, but not all insects are bugs.

Strictly speaking, "bugs" are an order of insects called Hemiptera. "True Bugs" as entomologiss also call them, are insects that have hypodermic-needle-like mouthparts. These beaks are perfect for piercing into tissue to slurp up fluids, whether from other insects, plants or — in the case of appropriately named bedbugs — blood from sleeping humans.

"True Bugs" - Bedbugs, Assassin Bugs, Stick Bugs, and Aphids are all True Bugs

Not "True Bugs" - Ants, Bees, Butterflies, Moths, Flies and Mosquitoes