Englishfor English speakers
united
Adjective
—
I some things (two or more) are united they are together. These act as one thing. This is often used for people of groups of people.
We are united in our goals.
John as Sue were united in holy matrimony (marriage) last week.
We stand united against our enemies.
into
Preposition
—
from out to in
I opened the door and stepped into the house.
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.