In Colossians 2:23, "a show of wisdom in will-worship," for ethelothreskia), a word found nowhere else but formed exactly like "will-worship": worship originating in the human will as opposed to the divine, arbitrary religious acts, worthless despite their difficulty of performance.

Wills (12 Occurrences)

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Will-worship (1 Occurrence)
Will-worship. Willworship, Will-worship. Wilt . Int. Standard Bible Encyclopedia ...
(ASV WBS YLT). Willworship, Will-worship. Wilt . Reference Bible.
/w/will-worship.htm - 7k

Willworship

Wills (12 Occurrences)

Will-worship (1 Occurrence)