Common Words:
* Weekend
* Back-end
* Friend (Old English: "freond")
* Offend
* Send
* Trend
Less Common Words:
* Up-end
* In-between
* Attend
* Extend
* Blend (Old English: "bland")
* Fender
* Wend (archaic)
Other Possibilities:
* End-user
* End-of-life
* End-to-end
It's worth noting that the word "end" can also be part of a phrasal verb, which is a verb combined with a preposition or adverb. For example:
* End up
* End with
* End in
Let me know if you'd like to explore more specific types of compound words with "end"!