wall hanging vs arras

wall hanging and arras both are nouns.

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

As nouns, arras is a hyponym of wall hanging; that is, arras is a word with a more specific, narrower meaning than wall hanging:

wall hanging: decoration that is hung (as a tapestry) on a wall or over a window
arras: a wall hanging of heavy handwoven fabric often with pictorial designs

Other hyponyms of wall hanging include dossal, dossel, Kakemono, lambrequin, tapestry.

wall hanging (noun)	arras (noun)
decoration that is hung (as a tapestry) on a wall or over a window	a wall hanging of heavy handwoven fabric often with pictorial designs