wall hanging vs ornamentation

wall hanging and ornamentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
wall hanging	Yes	No	No	No
ornamentation	Yes	No	No	No

As nouns, ornamentation is a hypernym of wall hanging; that is, ornamentation is a word with a broader meaning than wall hanging:

wall hanging: decoration that is hung (as a tapestry) on a wall or over a window
ornamentation: something used to beautify

Other hypernyms of wall hanging include decoration, ornament.

wall hanging (noun)	ornamentation (noun)
decoration that is hung (as a tapestry) on a wall or over a window	the act of adding extraneous decorations to something
	something used to beautify
	the state of being ornamented