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The dictionary feature in vim allows you to use a file (for instance /usr/share/dict/words) and set multiple paths within the dict option to search on.
Now the file I'm searching on has several words with - in them, and I still wish to match after the - after activating autocomplete, so is there a way to make the - a matched character within the dict feature?
The option iskeyword defines which characters should be considered as part of a word. This option uses the += and -= syntax to add or remove some characters. Thus the following line will add the character - in the option and will allow you to complete words containing a -:
set iskeyword+=-
iskeyword just for a particular file type (eg CSS and SCSS), run something like: autocmd FileType css,scss setlocal iskeyword+=-
:h ftplugin-overrule) using an autocommand is just reimplementing the ftplugin mechanism.
set iskeyword+=-should do what you want. See:h 'iskeyword'. I'm not posting this as an answer because I can't test it right now so let me know if that work?