The Hindi word "खूब" (khūb) doesn't directly translate to a single English word, but it means very, exceedingly, extremely, or a lot. It's an adverb used to emphasize the degree of something.
For example:
* खूब अच्छा (khūb accha): very good
* खूब खाना (khūb khānā): a lot of food
* खूब मेहनत करो (khūb mehnat karo): work very hard
There is no word "khubool" in standard Hindi. It's possible there's a misspelling or a regional variation.