1 words in this vocabulary list
noun A noun is a word that represents a person, place, thing, or idea. In this case, 'muffle' can be a noun when referring to a device used to deaden sound or a covering for the hands or ears to keep warm, while 'up' is not a noun.
verb A verb is a word that expresses an action or state of being. 'Muffle up' is a verb phrase that means to wrap or cover oneself or someone else to keep warm.