This is the 842nd most frequent Chinese word.
促
To promote, urge, or hasten.
促使 here means 'to promote or cause something to happen', used to indicate encouraging an action or progress.
我们应该促使技术进步以提高效率。
We should promote technological advancements to improve efficiency.
促销 here refers to 'promote sales', used as part of a compound word for business contexts.
由于市场需求的增长，企业被迫促销新产品。
Due to the increase in market demand, the company was compelled to promote new products.
促成 means 'to facilitate or bring about', emphasizing the act of helping to achieve a result.