bug

(noun): An insect of the order Hemiptera (the “true bugs”).
(noun): Any of various species of marine or freshwater crustaceans; e.g. a Morton Bay bug, mudbug.
(noun): Any insect, arachnid, or other terrestrial arthropod that is a pest.
(noun): Any insect, arachnid, myriapod or entognath.
(noun): (chiefly computing and engineering jargon) A problem that needs fixing.
(noun): A contagious illness; a bacterium or virus causing it
(noun): An enthusiasm for something; an obsession
(noun): A keen enthusiast or hobbyist.
(noun): A concealed electronic eavesdropping or intercept device
(noun): A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
(noun): 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
(noun): A manually positioned marker in flight instruments.
(noun): A semi-automated telegraph key.
(noun): Hobgoblin, scarecrow; anything that terrifies.
(noun): ("the bug") HIV.
(noun): A limited form of wild card in some variants of poker.
(noun): A trilobite.
(noun): A young apprentice jockey.
(verb): To annoy.
(verb): To install an electronic listening device or devices in.
(noun): A microfossil, particularly a foraminiferan.