Synonyms for Tamper (same or very similar meaning)
WordNet sense 1 (a tool for tamping (e.g., for tamping tobacco into a pipe bowl or a charge into a drill hole etc.)):
tamp, tamping barWordNet sense 2 (intrude in other people's affairs or business; interfere unwantedly):
meddleWordNet sense 3 (play around with or alter or falsify, usually secretively or dishonestly):
fiddle, monkeyFrom the ODE community, based on WordNetadd/edit