You would have to build on words already played to spell weltschmerz.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --RZ--A--. That is, nine letter words with 3rd letter R and 4th letter Z and 7th letter A. In alphabetical order, they are: marzipans
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --RZ-I-. That is, seven letter words with 3rd letter R and 4th letter Z and 6th letter I. In alphabetical order, they are: borzois
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---L-RZ. That is, seven letter words with 4th letter L and 6th letter R and 7th letter Z. In alphabetical order, they are: fahlerz
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern F----RZ. That is, seven letter words with 1st letter F and 6th letter R and 7th letter Z. In alphabetical order, they are: fahlerz
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern S---RZ--. That is, eight letter words with 1st letter S and 5th letter R and 6th letter Z. In alphabetical order, they are: scherzos
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --C-RZ--. That is, eight letter words with 3rd letter C and 5th letter R and 6th letter Z. In alphabetical order, they are: alcorzas
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --H-RZ--. That is, eight letter words with 3rd letter H and 5th letter R and 6th letter Z. In alphabetical order, they are: scherzos
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --H--RZ--. That is, nine letter words with 3rd letter H and 6th letter R and 7th letter Z. In alphabetical order, they are: fahlerzes
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---RZ--O-. That is, nine letter words with 4th letter R and 5th letter Z and 8th letter O. In alphabetical order, they are: sforzatos
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -V-RZ----. That is, nine letter words with 2nd letter V and 4th letter R and 5th letter Z. In alphabetical order, they are: overzeals
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --RZ--E. That is, seven letter words with 3rd letter R and 4th letter Z and 7th letter E. In alphabetical order, they are: warzone
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --H--RZ. That is, seven letter words with 3rd letter H and 6th letter R and 7th letter Z. In alphabetical order, they are: fahlerz