The best replacement for apart is part.

The best alternatives to apart are rated as following:
★★★★★  part
★★★★  away
★★★  aside
★★  together
★  farther apart
★  beside
★  heart of darkness
★  side by side
★  second coming
★  apart
  kruk
  a part

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Speaking about apart, one probably shouldn't forget about falling to pieces.

Other search terms related to apart and their ratings are:
★★★★★ falling to pieces
★★ going to pieces
★ friends quotes
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apart
part
away