noun:

1. A manually positioned marker in flight instruments.
2. A small, usually transparent or translucent image placed in a corner of a television program to indicate what network or cable channel is televising it.
3. A concealed electronic eavesdropping or intercept device.
4. A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
5. Synonym of union bug.
6. Any insect, arachnid, myriapod or entognath.
7. A problem that needs fixing.
8. Any insect, arachnid, or other terrestrial arthropod that is a pest.
9. An insect of the order Hemiptera (the “true bugs").
10. Hobgoblin, scarecrow; anything that terrifies.
11. Synonym of oil bug.
12. A Volkswagen Beetle car.
13. A Bugatti car.
14. An enthusiasm for something; an obsession.
15. A contagious illness; a bacterium or virus causing it.
16. A limited form of wild card in some variants of poker.
17. A bedbug.
18. HIV.
19. A keen enthusiast or hobbyist.
20. A trilobite.
21. Any of various species of marine or freshwater crustaceans; e.g. a Moreton Bay bug, mudbug.
22. A young apprentice jockey.
23. A semi-automated telegraph key.

verb:

1. To install an electronic listening device or devices in.
2. To annoy.

name:

1. A river flowing northwest 450 miles between Belarus and Poland.
2. A river in Ukraine, flowing 530 miles to the Dnieper estuary.