renewal vs filling

renewal and filling both are nouns.

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

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

renewal (noun)	filling (noun)
the conversion of wasteland into land suitable for use of habitation or cultivation	the act of filling something
the act of renewing	the yarn woven across the warp yarn in weaving
filling again by supplying what has been used up	(dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth
	a food mixture used to fill pastry or sandwiches etc.
	flow into something (as a container)
	any material that fills a space or container