Matching keyword to a URL

When matching a keyword to a URL, I'm just wondering if these two would be the same?

/word1/word2
/word1-word2

I'm using word1 to organize my url, so it acts like a category, however sometimes I need that category in the keyword, so I'm wondering if I should just do:

/word1/word1-word2

Or is that getting redundant and not necessary?

/word1/word1-word2 <-- This is fine as you are not gonna use the same in all posts URLs