Natalie Spooner, Sarah Nurse, Rebecca Johnston and Sarah Fillier scored for Canada in a game that had flashes of ill-temper, especially in the second period.
Canada enters the 2023 tournament as the defending champions from 2022.
Canada and the United States will almost certainly play for the gold medal. Where the women's game goes after is uncertain.
First worlds on Canadian ice with fans in the stands since 2016 will open Wednesday in Brampton. By Mark Zwolinski Toronto Star.
New mom Natalie Spooner opens the scoring in Brampton on the way to victory over the Swiss.
Canada scored twice on the power play en route to a comfortable 4-0 win over Switzerland at the IIHF Women's World Hockey Championship.