signature vs manner

signature and manner both are nouns.

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

As nouns, manner is a hypernym of signature; that is, manner is a word with a broader meaning than signature:

Other hypernyms of signature include fashion, mode, style, way.

signature (noun)	manner (noun)
a distinguishing style	a way of acting or behaving
your name written in your own handwriting	how something is done or how it happens
a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book	a kind
the sharps or flats that follow the clef and indicate the key
a melody used to identify a performer or a dance band or radio/tv program