research or researches

Which form is correct: “research” or “researches”?

“research” is correct.

research is usually thought of as uncountable.

For example,

There has been much research about this illness.

Use studies instead of researches.

For example,

Very few studies have noted the role this plays in shaping power relations.

However, researches is used rarely. It means multiple research activities.

For example,

His researches on the fossil woods led him to researches on other fossils.