"Certificate" and "license" synonymous.

RCW 18.50.130
in effect
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The words "certificate" and "license" shall be known as interchangeable terms in this chapter. The words "certificate" and "license" shall be known as interchangeable terms in this chapter.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=18.50&full=trueFetched: 6/29/2026

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