banality vs platitude

banality and platitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
banality	Yes	No	No	No
platitude	Yes	No	No	No

As nouns, banality and platitude are synonyms defined as:

Other synonyms of banality include bromide, cliche, commonplace.

banality (noun)	platitude (noun)
a trite or obvious remark	a trite or obvious remark