Do manual do vim:
To add words to your own word list:
zg Add word under the cursor as a good word to the first
name in 'spellfile'. A count may precede the command
to indicate the entry in 'spellfile' to be used. A
count of two uses the second entry.
In Visual mode the selected characters are added as a
word (including white space!).
When the cursor is on text that is marked as badly
spelled then the marked text is used.
Otherwise the word under the cursor, separated by
non-word characters, is used.
If the word is explicitly marked as bad word in
another spell file the result is unpredictable.
zG Like "zg" but add the word to the internal word list
|internal-wordlist|.
zw Like "zg" but mark the word as a wrong (bad) word.
If the word already appears in 'spellfile' it is
turned into a comment line. See |spellfile-cleanup|
for getting rid of those.
zW Like "zw" but add the word to the internal word list
|internal-wordlist|.
zuw
zug Undo |zw| and |zg|, remove the word from the entry in
'spellfile'. Count used as with |zg|.
zuW
zuG Undo |zW| and |zG|, remove the word from the internal
word list. Count used as with |zg|.
Na linha de comando:
:[count]spe[llgood] {word}
Add {word} as a good word to 'spellfile', like with
|zg|. Without count the first name is used, with a
count of two the second entry, etc.
:spe[llgood]! {word} Add {word} as a good word to the internal word list,
like with |zG|.
:[count]spellw[rong] {word}
Add {word} as a wrong (bad) word to 'spellfile', as
with |zw|. Without count the first name is used, with
a count of two the second entry, etc.
:spellw[rong]! {word} Add {word} as a wrong (bad) word to the internal word
list, like with |zW|.
:[count]spellu[ndo] {word}
Like |zuw|. [count] used as with |:spellgood|.
:spellu[ndo]! {word} Like |zuW|. [count] used as with |:spellgood|.
Para mais ajuda sobre a magia no vim, digite :help spell ou :help spell-quickstart