* If "zoo" is used as a common noun, it is not capitalized. For example:
* "We went to the zoo yesterday."
* "The zookeeper showed us the baby monkeys."
* If "zoo" is part of a proper noun (the official name of a specific zoo), then it is capitalized. For example:
* "We visited the San Diego Zoo."
* "The Bronx Zoo is famous for its gorillas."
Let me know if you have another word you'd like to check!