The best replacement for stronger is bigger.

The best alternatives to stronger are rated as following:
★★★★★  bigger
★★★  more strongly
★★★  angel on my shoulder
★★★  more strong
★  aurich en vivo
★  gimme more
★  weaker
★  lion
  weaker than covalent bonds
  faster
  strongest
  covalent bond
  intergalactic
  xanax 0.25
  tiger

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Speaking about stronger, one probably shouldn't forget about getting bigger.

Other search terms related to stronger and their ratings are:
★★★★★ getting bigger
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Google Trends

Scale is based on the average worldwide traffic of stronger in all years. Click on graph for more.
stronger
bigger
more strongly