What the adverb comfort?

The term "comfort" is primarily used as a noun or verb, not as an adverb. As a noun, it refers to a state of physical ease and well-being, while as a verb, it means to soothe or provide relief to someone in distress. If you meant an adverb related to "comfort," you might be thinking of "comfortably," which describes doing something in a relaxed and easy manner.