banister vs bannister

banister and bannister both are nouns.

Word	Noun	Adjective	Verb	Adverb
banister	Yes	No	No	No
bannister	Yes	No	No	No

As nouns, banister and bannister are synonyms defined as:

banister and bannister: a railing at the side of a staircase or balcony to prevent people from falling

Other synonyms of banister include balusters, balustrade, handrail.

banister (noun)	bannister (noun)
a railing at the side of a staircase or balcony to prevent people from falling	a railing at the side of a staircase or balcony to prevent people from falling