Gossip is idle personal talk; groundless rumor. Slander is defamation, generally malicious, whether oral or written.
Proverbs 15:2: " The tongue of wise ones does good with knowledge, but the mouth of the stupid ones bubbles forth with foolishness."
Proverbs 13:5: " A false word is what the righteous hates, but the wicked ones act shamefully and cause disgrace for themselves"
1 Timothy 5:13: " At the same time they also learn to be unoccupied, gadding about to the houses; yes, not only unoccupied, but also gossipers and meddlers in other people’s affairs, talking of things they ought not. "
2 Thes. 3:11: " For we hear certain ones are walking disorderly among YOU, not working at all but meddling with what does not concern them. "
Proverbs 6:16-19: " There are six things that Jehovah does hate; yes, seven are things detestable to his soul: lofty eyes, a false tongue, and hands that are shedding innocent blood, a heart fabricating hurtful schemes, feet that are in a hurry to run to badness, a false witness that launches forth lies, and anyone sending forth contentions among brothers."