How to find proper key words to find company related news in text mining?

i want to do web crawler to grab related news for certain company, but how can i find certain synonym keywords to explore the title or contents that is related to the company?

for example: I want to find news related to APPL:US , but the news title will use key words like "apple" "apple inc"...etc.

Is there any website or resources for finding those keywords?

thanks