One-word Substitution: Part 11

1. Words opposite in meaning: antonym
2. Words different in meaning but similar in sound: homonym
3. Words similar in meaning: synonym
4. Anything which is no longer in use: obsolete
5. Article sold by one country to another: export
6. Article bought by one country from another: import
7. A state which is impartial to all religions: secular
8. That which cannot be heard: inaudible
9. That which cannot be consumed by fire: incombustible
10. That which cannot be believed: incredible