Furthermore
Still, More, Greater
adverb, conjunction
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you:
When is the best time to use the word furthermore? Right now (なお)! That's because you've just finished saying what you originally wanted to say, and now, you've realized there's even more you want to say.
温めて食べたら、尚、おいしくなりますよ。
If I warm it up and eat it, it becomes even more delicious.