Singular keywords and plural keywords, both ranks differently on search engines. I think, Google consider two different keywords for singular and plural keywords. Which keyword (singular and plural keyword) is good regarding SEO ranking? And, does it matter which one you target?
@Steve_SmithJan 16.2013 — #Before targeting and keyword (Singular or plural keywords) we must check its Global and Local Monthly search in Google Adword Tools. Singular keywords and plural keywords are consider as different keywords and plural keywords have more searches then singular keywords.
@anirban09PAug 20.2015 — #Google does rank singular and plural keywords differently just try to target the ones that are most used. Check the Google Adwords keyword tool.
@alexandersimAug 23.2015 — #You cannot say if singular is better than plural or vice versa, the thing is you have to check how people search and which terms they use. For instance for a web design company the keyword "web developer" seems logical but users search "web developers in city name". So if you use Google then use Google keyword planner and find out the most searched phrases, watch out for competition and power of the keyword as well. Good luck