tea ceremony vs chanoyu

tea ceremony and chanoyu both are nouns.

Word	Noun	Adjective	Verb	Adverb
tea ceremony	Yes	No	No	No
chanoyu	Yes	No	No	No

As nouns, tea ceremony and chanoyu are synonyms defined as:

tea ceremony and chanoyu: an ancient ritual for preparing and serving and drinking tea

tea ceremony (noun)	chanoyu (noun)
an ancient ritual for preparing and serving and drinking tea	an ancient ritual for preparing and serving and drinking tea