invade, occupy(verb) march aggressively into another's territory by military force for the purposes of conquest and occupation. Synonyms: lodge in, invade, occupy, encroach upon, engross, obtrude upon, intrude on, busy, worry, absorb, engage, reside, concern, overrun, fill, infest, interest, take, use up.
It's my understanding that the difference between a violin and a fiddle is the bridge. The bridge on a violin is flatter that the fingerboard. However, on a fiddle, the contour of the bridge is made to match the contour of the fingerboard.
Due to the properties and desired sound, fiddlers often choose steel strings (which produce a brighter tone) for their instruments, versus gut or synthetic core strings (which produce a deeper tone). Fiddle is also a common term among musicians who play folk music on the violin. The fiddle is part of many traditional (folk) styles of music which are aural traditions, taught 'by ear' rather than via written music.