besmirch vs slander

besmirch is not a noun while slander is a noun.

Word	Noun	Adjective	Verb	Adverb
besmirch	No	No	Yes	No
slander	Yes	No	Yes	No

As verbs, besmirch and slander are synonyms defined as:

besmirch and slander: charge falsely or with malicious intent; attack the good name and reputation of someone

Other synonyms of besmirch include asperse, calumniate, defame, denigrate, smear, smirch, sully.

besmirch (noun)	slander (noun)
	an abusive attack on a person's character or good name
	words falsely spoken that damage the reputation of another

besmirch (verb)	slander (verb)
charge falsely or with malicious intent; attack the good name and reputation of someone	charge falsely or with malicious intent; attack the good name and reputation of someone
smear so as to make dirty or stained