filling vs intermixture

filling and intermixture both are nouns.

Word	Noun	Adjective	Verb	Adverb
filling	Yes	No	No	No
intermixture	Yes	No	No	No

As nouns, intermixture is a hypernym of filling; that is, intermixture is a word with a broader meaning than filling:

Other hypernyms of filling include concoction, mixture.

filling (noun)	intermixture (noun)
the act of filling something	the act of mixing together
the yarn woven across the warp yarn in weaving	an additional ingredient that is added by mixing with the base
(dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth	any foodstuff made by combining different ingredients
a food mixture used to fill pastry or sandwiches etc.
flow into something (as a container)
any material that fills a space or container