The best replacement for time series is cross sectional.

The best alternatives to time series are rated as following:
★★★★★  cross sectional
★★★★  panel data
★★★★  regression
★★★  cross section
★★  longitudinal
★★  repeated measures
★★  survival analysis
★★  linear regression
★★  cross sectional data
★  cross sectional data definition
★  regression analysis
★  panel
★  stochastic process
★  longitudinal data analysis
  longitudinal data
  time series
  cross-sectional data
  cross-section data
  econometrics
  cross sectional analysis

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Speaking about time series, one probably shouldn't forget about stata.

Other search terms related to time series and their ratings are:
★★★★★ stata
★★ seasonality
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time series
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