The best replacement for exponential is linear.

The best alternatives to exponential are rated as following:

★★★★★	linear
★★★	logistic growth
★★★	logarithmic
★★	geometric
★★	power
★★	quadratic
★	geometric growth
★	linear growth
★	logistic
★	logarithmic equation
★	power function
★	polynomial
★	logarithmic functions
★	simple moving average
★	factorial
★	logarithmic growth
★	linear functions
	scientific notation
	factorial grows faster
	power law
	logistic population growth
	power functions
	hyperbolic
	arithmetic growth
	normal distribution
	linear graphs
	linear graph
	linear equations
	parabolic
	gamma distribution
	log
	hyperbolic discounting
	poisson distribution
	quadratic function
	weibull
	poisson
	arithmetic

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Speaking about exponential, one probably shouldn't forget about complex numbers.

Other search terms related to exponential and their ratings are:

★★★★★	complex numbers
★	complex number
	asymptote

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Google Trends

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exponential

linear

logistic growth