Plurals of words and its affect on SEO?

sure you would rank for that, but you need to give off more influence with plurals too, with anchor text links.

Hey Dexx,

Without getting into semantic algorithms and theories - for your example, I'll just say that you should build links to your site using both words: "Cars" and "Car".

My very loose testing for search keywords (not keywords within domains) has shown that G will return very similar results for plural and singular words - but not exact results. Do a search for "cleaning products" and "cleaning product" to see what I mean.

Anyway, you should ask yourself which one (keyword/phrase) would you rather rank for - the plural or singular. In my personal KW research experience, I've found that most of of the keywords I rank for are plurals. But, that's just me.

You'll want to do proper market and keyword research and draw a conclusion based on that. This is so you won't wind up wasting time, money and effort building links for keywords that do not get searched much.

For example, when your target market performs searches, do they type "I want to buy a used car in denver" or... "buy used cars in denver"?

Keywords in domain names do help - but not so much because of the actual domain name. Rather, if you have a domain such as the one in your example, most people will link to your site using the very words in the domain name. So, there's isn't much SEO magic going on there.

Hope this helps.

- Jay

with plural word(s)..singular form of the word can also be crawled...

I agree, it makes sense to focus primarily on the plural since it's mostly the way search terms are formulated. However, I'm rather in two minds as to whether the plurals will make you automatically rank for the singulars.

I'm putting together a website with 'opportunity' as the last word. I could have it as 'opportunities'. When writing the content I can use either word. So it shouldn't make a difference should it?
When searching for my particular content in Google the result of both phrases are similar, with the singular slightly ahead.

It may take a while for it to settle out. I've had sites with a plural domain that were very highly ranked for the singular while the plural was nowhere to be found in the SERPs. However, after a few months they seem to come together and rank very similarly regardless of whether you type in the singular or plural as a search query.

but sometimes, singular forms has lots of conversions than plurals

Well, one can't legitimately state in an umbrella way that either plurals or singulars rank better. For each individual case, it is necessary to do the relevant research and see what the distribution for particular singular and plural terms look like. Another consideration is which word is the core of a particular phrase. I'm not particularly sure it is going to of great help, but here's an article dealing with this Hitwise Intelligence - Robin Goad - UK (just skim it for the idea).