The best replacement for length is width.

The best alternatives to length are rated as following:
★★★★★  width
★★★★  girth
★★  velocity
★  height
★  width first
★  thickness
★  depth
★  lap
★  duration
★  girth more important
★  carbine
★  arc
★  height first
★  frequency
★  length()
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Your alternative for length is not listed? Suggest!
Speaking about length, one probably shouldn't forget about layers.

Other search terms related to length and their ratings are:
★★★★★ layers
★★★★★ limits mascara
★★★★ radius
★★ metric units
★ side bangs
★ height
You have in mind a companion for length and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of length in all years. Click on graph for more.
length
width
girth