i was told that a singular will show up in both (plurals and singular)searched on google ?
Yes. Only the ranking varies. I have a couple of domains in which i own both the singular and the plural version (shut out possible fence sitters). My plan is to redirect one to the other. But the question is, which to redirect to which. So what i did was fill both domains with identical content until they get indexed, then unique content afterwards and see which one fares better.
Basing on the domain alone (not including content matches), Google matches the exact search term and the domain ranks on top.
Just an illustrative example: If a user searches for "hotdog", Google returns "hotdog dot com" at the top of search results. But "hotdog
s dot com" doesn't necessarily come in 2nd place. Eventhough Google matches search terms to phrases "within" the domain name, they are not considered as "exact match". And i further noticed that once your domain is not an exact match, you then have to compete with the rest of the world based on "contextual" content matches.
This means, if a user types "hotdog", a domain called "hotdogs dot com" will not rank any better than a domain called "bestsandwiches dot com" if the latter has more contextual quality matches than "hotdogs dot com".
In actual life: If you search for "hotdog" on Google, a domain called "sausage.com" even ranks well. I'm not sure if the Google robot has synonyms programmed into it, but what i see is that it simply matches "hotdog" within its content.
The domain becomes irrelevant. (or maybe minimal factor, to the point of being practically irrelevant in Google search ranking)
This proves that if your domain has solid content (seo and all), it doesn't matter
to Google whether it is plural, singular, or exotic.