Are the keywords all related to one niche? Or are they different niches? My understanding is that Google considers overall content of a website when ranking each page (ranking means where your page will appear on the left side of the search results page). Of course the most important factor (for now) is the anchor text and quality of Inbound links to each page.
Subdomains are viewed as separate Websites, so are not good for your purposes. Best to create an authority site in your niche. Create separate pages for each keyword. Use linking strategies from your own pages linking to other pages. Page titles as links on your pages also serve as an internal linking strategy, good for ranking.
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