As nouns the difference between idiot and one
is that
idiot is (slang|derogatory) a proponent of intelligent design while
one is (mathematics) the neutral element with respect to multiplication in a.
As a numeral one is
(cardinal) a numerical value equal to ; the first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set ordinal: first.
As a pronoun one is
(
lb) one thing (among a group of others); one member of a group.
As an adjective one is
of a period of time, being particular; as, one morning, one year.
As a verb one is
(obsolete|transitive) to cause to become one; to gather into a single whole; to unite.