Synonyms for Natter:

n.

repartee, heart-to-heart, conversation, banter, waffle. natter (noun)
chitchat, chaffer, confabulate, chat, visit, claver, chatter, jaw, confab, gossip.

v.

buzz (verb)
chatter.
chatter (verb)
gossip, chat, chitchat, jaw.

Other synonyms:

Other relevant words:
repartee, heart-to-heart, conversation, banter, waffle.