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Synonyms for Tinker (same or very similar meaning)

WordNet sense 1 (a person who enjoys fixing and experimenting with machines and their parts):
tinkerer

WordNet sense 2 (small mackerel found nearly worldwide):
chub mackerel, Scomber japonicus

WordNet sense 3 (do random, unplanned work or activities or spend time idly):
monkey, potter, putter, mess around, monkey around, muck about, muck around

WordNet sense 4 (try to fix or mend):
fiddle


From the ODE community, based on WordNetadd/edit