WordNet sense 1 (a fault or defect in a system or machine):

glitch

WordNet sense 2 (insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis):

hemipteran, hemipteron, hemipterous insect

WordNet sense 3 (tap a telephone or telegraph wire to get information):

intercept, tap, wiretap, intercept

WordNet sense 4 (annoy persistently):

badger, beleaguer, pester, tease

WordNet sense 5 (a minute life form (especially a disease-causing bacterium); the term is not in technical use):

germ, microbe