The noun chever has two distinct semantic fields: (1) a company, band, or fellowship of people united by a common bond (from chavar, 'to join'); and (2) a spell or enchantment (in the context of forbidden occult practices). Context determines which meaning is operative.
The prohibition of enchantments (chever) in Isaiah 47:9, 12 belongs to the broader biblical condemnation of divination and magic as false bids for control that belong to God alone. In contrast, the positive use of chever as 'fellowship' or 'company' (Psalm 119:63: 'a companion of all who fear you') points toward the covenant community as the divinely ordained context for human flourishing. True fellowship is grounded in shared devotion to God, not occult alliance.