The best replacement for overlap is interlock grip.

The best alternatives to overlap are rated as following:
★★★★★  interlock grip
★★★★★  intersect
★★★★  beaded pool liner
★★★★  interlock
★★★★  beaded liner
★★★  interlock golf grip
★★★  lsa
★★★  tongue and groove
★★  shiplap
★★  interlocking golf
★★  beaded liners
★  interlocking grip
★  overlap with
★  shiplap shed
  interposition
  beaded
  overlay
  interruption
  interlocking golf grip
  voice crossing

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Speaking about overlap, one probably shouldn't forget about or overlap.

Other search terms related to overlap and their ratings are:
★★★★★ or overlap
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Google Trends

Scale is based on the average worldwide traffic of overlap in all years. Click on graph for more.
overlap
interlock grip
intersect