In keyword research for an ecommerce site, I've found that widget, singular gets a lot more searches than widgets, plural AND is much less competitive. Is it better for SEO purposes to have the URLs (and matching title tags) in the catalog as /brass-widget.html, /steel-widget.html, etc., or /brass-widgets.html, etc.? I'm worried that a) searches for widgets will pass by the singular urls but not vice versa, and b) the singular form will strike visitors as bad grammar. Any advice?