supplanting vs replacing

supplanting and replacing both are nouns.

Word	Noun	Adjective	Verb	Adverb
supplanting	Yes	No	No	No
replacing	Yes	No	No	No

As nouns, replacing is a hypernym of supplanting; that is, replacing is a word with a broader meaning than supplanting:

supplanting: act of taking the place of another especially using underhanded tactics
replacing: the act of furnishing an equivalent person or thing in the place of another

Other hypernyms of supplanting include replacement.

supplanting (noun)	replacing (noun)
act of taking the place of another especially using underhanded tactics	the act of furnishing an equivalent person or thing in the place of another