@Loh Jane,
Quote:I have one question. Dictionary.com has more words than other dictionaries. For example [a] the word ‘factful’. Can I use the previously mentioned word? Does this word really exist?
Yes, it exists. Yes, you can use it but it's not a common word at all, Jane. In fact it's very uncommon.
English speakers create new words all the time. Dictionaries never create new words. That's not their job. Their job is to catalog the new words that are created by people using language. New words sometime stick and become commonly used; sometimes these new words expand into all the registers of English. Many die out and enter the dustbin of history. Some morph into different meanings.