Thanks. So, you mean both of them mean "the end of something" but regarding the use of "tip" we can make use of it in some contexts and not others. And the same is true about "bottom". Right?
But, you know, in the story that I'm reading it and it is about starfish both "tip" and "bottom" have been used in the following sentences:
The starfish crawls along the bottom of the sea.
It sees with a spot on the tip of each arm.
Then, at the end of this story there is a set of exercises. In one of them the readers have been asked to find words in the story that mean:
1. End of something:
2. Creep
etc.
Now, in such a context which word between "tip" and "bottom" should be written here? I think we should write both of them, but explain that each word is used in a specific context. Right?