mode vs manner

mode and manner both are nouns.

Word	Noun	Adjective	Verb	Adverb
mode	Yes	No	No	No
manner	Yes	No	No	No

As nouns, mode and manner are synonyms defined as:

Other synonyms of mode include fashion, style, way.

mode (noun)	manner (noun)
how something is done or how it happens	a way of acting or behaving
the most frequent value of a random variable	how something is done or how it happens
any of various fixed orders of the various diatonic notes within an octave	a kind
a classification of propositions on the basis of whether they claim necessity or possibility or impossibility
verb inflections that express how the action or state is conceived by the speaker
a particular functioning condition or arrangement