In practice these are interchangeable: both introduce an additional supporting point. <em>The flat is small. Furthermore, it has no parking.</em> <em>The flat is small. Moreover, it has no parking.</em> The only tendency worth noting is that <em>moreover</em> often carries a slightly stronger, more decisive point, while <em>furthermore</em> reads as one more item on a list — but no reader will fault you for either.
Be honest: there is barely a difference
Most style guides describe these two as near-synonyms, and usage bears that out. Both are formal connectives meaning roughly "and in addition", both sit at the start of a sentence followed by a comma, and both can be swapped for the other in almost any sentence without the meaning changing.
If someone tells you there is a firm rule separating them, be sceptical. What exists is a soft tendency, not a grammatical distinction.
The tendency, stated fairly
- Furthermore continues an accumulation. It suits the third point in a list of five, each roughly equal in weight. The data set is small. Furthermore, it covers only one region.
- Moreover more often introduces something that raises the stakes — the point that settles the argument. The contract was never signed. Moreover, the supplier had already been paid.
Reverse those two examples and nothing breaks. That is the honest position.
A test you can run
Try reading the sentence with "and what's more" in place of the connective. If that feels right — you are landing a heavier blow — moreover is a natural fit. If "and also" feels closer, furthermore sits more comfortably. Either way, check the more important question: does the sentence need a connective at all?
The real problem with both
Overuse is a far bigger writing fault than choosing the wrong one. Both words are heavy and formal, and stacking them makes prose sound like a bad essay:
Furthermore, the costs rose. Moreover, delivery slipped. Furthermore, the client complained.
Most of the time, plain alternatives read better: also, and, on top of that, what's more, or simply a new sentence with no connective at all. In business and academic writing, one moreover per page is plenty.
Punctuation and position
Both take a comma when they open a sentence: Moreover, the deadline had passed. If you join two independent clauses with either word, you need a semicolon or a full stop before it, not a comma — The deadline had passed; moreover, no extension had been requested. Writing "The deadline had passed, moreover no extension..." is a comma splice.
Both can also appear mid-sentence, set off by commas: The costs, moreover, were never approved. That position slows the sentence and adds emphasis, so use it sparingly.
What they do not mean
Neither word signals contrast. If your second point undercuts the first, you want however or nevertheless, not furthermore.
Frequently Asked Questions
Can I use furthermore and moreover in the same paragraph?
You can, but it usually reads as padding. Keep one and replace the other with <em>also</em>, <em>and</em>, or nothing — the logical link is often clear without any connective.
Is it "Moreover," with a comma?
Yes, when it opens a sentence: <em>Moreover, the figures were out of date.</em> If it joins two clauses inside one sentence, use a semicolon before it: <em>The figures were old; moreover, they were unaudited.</em>
Which is more formal?
Both are formal and neither is noticeably more so. If you want something lighter, use <em>also</em>, <em>plus</em> (informal), or <em>on top of that</em>.