1. He is an old college buddy of mine.

2. He is an old university buddy of mine.
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Are both OK? Which one is commonly used? Does 'buddy' mean 'friend'? Can we substitute 'friend' for 'buddy'?

Both are OK. Most people just use #1, whether one graduated from a college or a university. It seems to cover the whole category!

And yes, either "friend" or "buddy" will do for men, but "buddy" wouldn't be used for women.

write a passage using rhetorical devices on a person,idea or ideology.(300 words)

Both sentences are correct and commonly used. "College buddy" and "university buddy" are interchangeable phrases that mean a close friend or companion from college or university.

Yes, the term "buddy" generally means "friend" or "companion." It is often used in an informal and friendly context to refer to someone you have a close relationship with.

You can substitute "friend" for "buddy" in these sentences without changing the meaning. However, keep in mind that "buddy" has a slightly more casual and familiar tone compared to "friend."