Searching what the reserved words are before you create tables in Oracle is crucial.
In the following link, you can see the reserved words.
In my first group project, I remember that we used some reserved words to create tables, so errors occurred when we were creating. I created new tables on eXERD, and the system said Invalid table name.
https://docs.oracle.com/cd/B19306_01/em.102/b40103/app_oracle_reserved_words.htm
If you find it hard to come up with new words instead of reserved words, you can refer to this website for synonyms.
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