The best replacement for diameter is radius.

The best alternatives to diameter are rated as following:
★★★★★  radius
★★★★★  circumference
★  width
★  area
★  pitch
★  radius protocol
★  flow rate
★  gauge
★  circumference graph
  circle
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  ss7
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  groove diameter
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  diametre

Your alternative for diameter is not listed? Suggest!
Speaking about diameter, one probably shouldn't forget about endpoints.

Other search terms related to diameter and their ratings are:
★★★★★ endpoints
★★★ circumference
★★★ circumference formula
★★ area
★ radius
only circumference
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diameter
radius
circumference