Solutions :

Boggle U R I C N H I R M R D S L U O N

3-letter words (1 point): 42

CID; CIS; DIS; DON; DOR; DOS; DSO; DUO; HIC; HID; HIS; HUN; IDS; ISO; LUD; LUM; LUR; MUD; NOD; NOR; NOS; NUR; ODS; ONS; ORD; OUD; OUR; RID; ROD; RUD; RUM; RUN; SIC; SIR; SOD; SON; SOU; SRI; UDO; UDS; URD; URN.

4-letter words (1 point): 48

CIDS; CIRL; CRIS; DIRL; DONS; DORM; DOUM; DOUR; DRUM; DUOS; DURN; DURO; HISN; IRID; IRIS; IRON; LUDO; LUDS; MUDS; MUON; MURL; NODI; NODS; NORI; NORM; NOUL; ODIC; ORDS; OUDS; OURN; RIDS; RODS; ROUL; ROUM; RUDS; SIDH; SIRI; SNOD; SORD; SORI; SORN; SOUL; SOUM; SOUR; UDON; UDOS; URDS; URIC.

5-letter words (2 points): 16

DORIC; DORIS; DUROS; IRIDS; IRONS; LUDIC; LUDOS; LURID; MUDIR; MUONS; MURID; NORIS; SIRIH; SODIC; UDONS; UNRID.

6-letter words (3 points): 3

MUDIRS; MURIDS; NORDIC.