According to Merriam-Webster, it means "in addition to what has been said" or "besides." It's generally used to supplement an argument.
Example:
I don't like that car; it's too small to fit all of us into. Moreover, it's green, and I hate green.
The word moreover is an adverb. It is another word for furthermore.
The price is reasonable and, moreover, the location is perfect.
Moreover, this prime example should not be overlooked.
moreover; besides
He set a new record in the race,moreover,it was his third record of the month.
I won't have my report for the meeting on Friday, moreover, I won't even be in on Friday.
Santa knows when you are sleeping. Moreover, he knows when you are being good.
emphasis and purpose
I have several sentences for you.You're fun to be with; moreover, you're a nice person.I can't come with you; moreover, I don't really want to.That is a bad decision; moreover, it's morally wrong.
"The boy's mother was sick of asking him to take out the garbage; moreover, he still hadn't cleaned his room."
but, on the other hand, however, moreover, also
Also... In addition... Moreover... Equally important... As well as... Likewise... Similarly... In fact... Consequently.. In the same way... -------------------- or perhaps 'and'