1. Despite, in spite of, notwithstanding: This meaning indicates that something happens or is true despite the fact that something else is also true.
* Example: Though he was tired, he kept working.
* Synonyms: Despite being tired, he kept working. In spite of being tired, he kept working. Notwithstanding his tiredness, he kept working.
2. Although, even though, while, whereas: These words introduce a statement that contrasts with the previous statement.
* Example: Though it was raining, I enjoyed my walk.
* Synonyms: Although it was raining, I enjoyed my walk. Even though it was raining, I enjoyed my walk. While it was raining, I enjoyed my walk. Whereas it was raining, I enjoyed my walk.
3. As if, as though (more informal): This meaning indicates a similarity or resemblance.
* Example: She looked though she had seen a ghost.
* Synonym: She looked as if she had seen a ghost.
4. However (more formal): This synonym is used to introduce a statement that contrasts with the previous statement, often introducing a different perspective or argument.
* Example: The plan was well-designed. However, it was ultimately unsuccessful.
Remember: The best synonym for "though" depends on the context of the sentence.