Englishfor English speakers
one
Determinative
—
(ordinal first) The number 1.
We have one nose and one mouth.
one
Noun
—
The number 1.
One is the smallest whole number.
one
Pronoun
—
One is a singular pronoun which means "someone" or "people". It is used more often in formal writing.
It is easy to see the difference if one looks closely enough.
collection
Noun
—
A collection is a group of things of the same type. They are usually special in some way.
He has one of the biggest collections of paintings by Van Gogh.
—
If you take a collection, you ask many people for money, for a particular reason.
The school took a collection for new books.