Phase and faze are homophones (words pronounced alike but different in meaning, derivation, or spelling) that may easily be confused. A phase is one of the forms in which matter can exist, such as solid, liquid, or a gas. There were two phases to the resolution;
His immaturity was a passing phase. Phase /feɪz/ n., v., phased, phas•ing. Her temper tantrums are just part of the phase she's going through.
See examples of phase used in a sentence. Phase generally refers to a distinct stage or period in a process of change or development. Definition of phase noun in oxford advanced learner's dictionary.