tinker

[1]	trifle , dabble , meddle , mess (around/about) , toy , fool/play (around/about) , (Brit) potter/(US) putter (about/around) , (Colloq) fiddle/monkey/muck (about/around)
[2]	putter , mess around , potter , monkey , monkey around , muck about , muck around
[3]	fiddle

[1]	tinkerer
[2]	chub mackerel , Scomber japonicus