90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
Both owing to and due to mean 'because of'. They are used in exactly the same way, except that due to can be used after the verb 'to be': Their failure was due to a lack of care and attention (not: was owing to).