multiphase vs polyphase

multiphase and polyphase both are adjectives.

Word	Noun	Adjective	Verb	Adverb
multiphase	No	Yes	No	No
polyphase	No	Yes	No	No

As adjectives, multiphase and polyphase are synonyms defined as:

multiphase and polyphase: of an electrical system that uses or generates two or more alternating voltages of the same frequency but differing in phase angle

multiphase (adjective)	polyphase (adjective)
of an electrical system that uses or generates two or more alternating voltages of the same frequency but differing in phase angle	of an electrical system that uses or generates two or more alternating voltages of the same frequency but differing in phase angle