Correct spelling, explanation: someone is an indefinite pronoun, which means it does not refer to any specific person, thing or amount, just like something, somewhere or somewhat. It consists of two parts: some + one. Some is a determiner (a modifying word that determines the kind of reference a noun or noun group has) and one is a number or a pronoun as well. This a very commonly used word in English, so it’s important not to spell it wrong. Just remember that somone is not correct.

Definition of someone:
pronoun, an unknown or unspecified person; some person
Someone had just knocked on the door, so my mother went to open it.
The math teacher wanted someone to come to his additional lessons.

Collocations with someone:
Some most commonly used collocations include: someone in need and someone like [you, her, him].
Never hurts to help someone in need.
When my boyfriend broke up with me, I really wanted to meet someone like him.

Incorrect spelling, explanation: you can’t spell the word someone as somone, because this version doesn’t exist. It’s just a mistake and we can just guess where it came from. It probably occurs due to the pronunciation – in this case, the -e vowel is silent. However, we can’t forget to put this letter in the word. Someone is a very common pronoun and it’s really well-known. Remember not to omit the first vowel in it.