cheer vs banzai

cheer and banzai both are nouns.

Word	Noun	Adjective	Verb	Adverb
cheer	Yes	No	Yes	No
banzai	Yes	No	No	No

As nouns, banzai is a hyponym of cheer; that is, banzai is a word with a more specific, narrower meaning than cheer:

Other hyponyms of cheer include bravo, hooray, hurrah, salvo.

cheer (noun)	banzai (noun)
the quality of being cheerful and dispelling gloom	a Japanese cheer of enthusiasm or triumph
a cry or shout of approval

cheer (verb)	banzai (verb)
become cheerful
spur on or encourage especially by cheers and shouts
show approval or good wishes by shouting
cause (somebody) to feel happier or more cheerful
give encouragement to