Also, Too, Likewise, Besides, Moreover and Furthermore all denote in addition and are used when joining (not necessarily in the same sentence) one proposition or consideration to another.
Also adds to a statement something that may be affirmed equally with what precedes.
- that where I am, there ye may be also
—Jn 14:3 - every simile ought not only to be well adapted to the subject, but also to include every excellence of description
—Goldsmith
Too is less formal than also, and adds with a lighter touch.
- like Twilight’s, too, her dusky hair
—Wordsworth - I can like now, and admire you too, sir
—Thackeray
Likewise is more formal and slightly more explicit than also; it sometimes implies specific likeness or connection between the ideas which it unites.
- have I not seen—ye likewise may have seen— Wordsworth
- Greek, was your ambition likewise doomed to failure?
—Browning
Besides, moreover, furthermore introduce a statement which must be taken into consideration along with the matter which precedes.
Besides usually introduces a statement that strengthens what has been said.
- his project is an excellent one; besides, it is likely to help a great many persons
Moreover is more emphatic than besides, and often serves as a transitional word between sentences: it often implies that the stronger of two considerations is yet to be presented.
- the mountain was steep and rugged; moreover, its sides were coated with ice
Furthermore is sometimes the most formal of these words; its chief use, however, is in a chain of additions where besides or moreover has already been used.
- he is well-liked; moreover, he is absolutely dependable; furthermore, there is no one who can take his place