As a case study, consider the Celestial Warlock Class Feature, Healing Light:
At first level, you gain the ability to channel celestial energy to heal wounds. You have a pool of d6s that you spend to fuel this healing. The number of dice in the pool equals 1 + your warlock level.
As a bonus action, you can heal one creature you can see within 60 feet of you, spending dice from the pool. The maximum number of dice you can spend at once equals your Charisma modifier (minimum of one die). Roll the dice you spend, add them together, and restore a number of hit points equal to the total.
Your pool regains all expended dice when you finish a long rest.
RAW, this doesn't specify any kind of action or phrase the warlock must perform in other to activate the ability, which would mean that it could be cast without the Warlock having to do anything other than turn their head. But from the context of what the spell actually does, it's pretty clear that this is very mechanically similar to the Healing Word spell that clerics have access to, which itself does have a Verbal component. They have the same casting time (1 bonus action), same range (60 feet), same effect (heal a creature), and the only major difference is the potency of the effect (Healing Word is xd4 + Spell-mod, Healing Light is [Spell-mod]d6).
Is it accurate to say that Healing Light has no verbal component? Or is its verbal component inferred by virtue of it being a Class Feature, or by its similarity to an actual spell that has a verbal component?