supplanter vs offender

supplanter and offender both are nouns.

Word	Noun	Adjective	Verb	Adverb
supplanter	Yes	No	No	No
offender	Yes	No	No	No

As nouns, offender is a hypernym of supplanter; that is, offender is a word with a broader meaning than supplanter:

supplanter: one who wrongfully or illegally seizes and holds the place of another
offender: a person who transgresses moral or civil law

Other hypernyms of supplanter include wrongdoer.

supplanter (noun)	offender (noun)
one who wrongfully or illegally seizes and holds the place of another	a person who transgresses moral or civil law