Growing up as a kid in Winnipeg, Bill Ezinicki clearly had hockey enthusiasm and toughness, so he was sent to get further training from a special hockey school run by the great Eddie Shore, whom Ezinicki called "the best hockey teacher I ever saw." He would then go on to a successful junior career in Oshawa, playing for the Generals of the OHA.
He began his NHL career in 1944-45 when he suited up for eight games with the Toronto Maple Leafs where he had a goal and five points. The following season was split between the Pittsburgh Hornets of the AHL and the Leafs, where he had four goals and 12 points in 24 games.
In 1946-47, Ezinicki's role on the team grew tremendously as he played in 60 games with the Leafs, scoring 17 goals and 20 assists for 37 points. He played three more seasons in Toronto, reaching at least the ten-goal and 20-point mark each year. Although he weighed just 170 pounds, he had the reputation of being one of the NHL's best bodycheckers, something that New York Ranger forward Edgar Laprade could have attested to, having been knocked unconscious by one of Ezinicki's thundering hits. There was a league investigation into the hit, but it was deemed legal
In 1950-51 he joined the Boston Bruins, scoring 35 points in 53 games. Ezinicki also was involved in an infamous stick-swinging duel with Detroit's Ted Lindsay in 1951, resulting 19 stitches for Ezinicki and three-game suspensions and $300 fines for both.
Ezinicki made a brief stop with the New York Rangers, playing 16 games with them in 1954-55 before deciding to retire to pursue golfing in the Boston area where he became a full-time pro and was soon earning more money golfing than he had ever made playing hockey