well they are 2 different meaningsfriends is plural(2 or more) of friendfriends' is plural possesive(2 or more friends that own 1 object)Example: I have many friends.Example 2: My friends' ball flew...
If you mean words that rhyme with the word friends: Pretends Mends Sends TendsThere's probably loads more but that's all I can think of now!Hope that helps! =) =D