The best replacement for isomers is resonance.

The best alternatives to isomers are rated as following:
★★★★★  resonance
★★★★  conformers
★★★★  isotopes
★★★  resonance structures
★★  constitutional isomers
★★  stereoisomers
★  perricone
★  geometric isomers
★  diastereomers
★  constitutional
★  conformational isomers
★  allotropes
★  configurational isomers
  same compound
  identical molecules
  enantiomers
  structural isomers
  polymers

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