Ice hockey is grouped with field hockey by implement and rule lineage, a deliberate call recorded on the category's own page, rather than with other winter sports.
Hockey Codes deliberately pulls ice hockey out of a generic winter-sports bucket and groups it with field hockey by implement and rule lineage instead, matching the recognized hockey codes grouping used in sport reference works. Both are stick-based goal-scoring team sports, regardless of surface, which is why they belong together rather than with other snow or ice disciplines.