Look-alikes
The pairs people mix up most, side by side.

Southern black widow or false black widow?
Brown recluse or southern house spider?
Hobo spider or giant house spider?
Blacklegged tick or American dog tick?
Brown marmorated stink bug or western conifer seed bug?
German cockroach or American cockroach?
Eastern yellowjacket or European paper wasp?
Bed bug or varied carpet beetle?