slander vs speech act

slander and speech act both are nouns.

Word	Noun	Adjective	Verb	Adverb
slander	Yes	No	Yes	No
speech act	Yes	No	No	No

As nouns, speech act is a hypernym of slander; that is, speech act is a word with a broader meaning than slander:

Other hypernyms of slander include calumniation, calumny, defamation, hatchet job, obloquy, traducement.

slander (noun)	speech act (noun)
an abusive attack on a person's character or good name	the use of language to perform some act
words falsely spoken that damage the reputation of another

slander (verb)	speech act (verb)
charge falsely or with malicious intent; attack the good name and reputation of someone