Wash. Rev. Code § 19.77.140
(1) Subject to the provisions of RCW 19.77.900 any person who shall:
(2) In determining whether, under this chapter, there is a likelihood of confusion, mistake, or deception between marks when used in association with goods or services, the court shall consider all relevant factors, including, but not limited to the following:
[ 2003 c 34 s 5; 1989 c 72 s 9; 1955 c 211 s 14.]