1. parallel
2. antiparallel, collateral, nonconvergent, nonintersecting, comparable, symmetrical, symmetric, synchronous

1. synchronal, synchronic, analogue
2. analog, similarity, latitude

1. line of latitude, parallel of latitude, line, match
2. fit, correspond, check, jibe, gibe, tally, agree, collimate
3. change, alter, modify, twin
3. duplicate, match, fit, correspond, check, jibe, gibe, tally, agree