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Level 18 - NIIHDMSI
The answer to this puzzle is:
Words: MINISH, IMIDS, HINDS, MINIS, MIDIS, HISN, HINS, IMID, HIMS, DINS, SINH, NISI, SHIM, MIDS, DIMS, MIDI, HIND, HIM, IDS, DIS, HID, INS, SIM, DIN, HIS
Bonus words:
MINISH, IMIDS, HINDS, MINIS, MIDIS, HISN, HINS, IMID, HIMS, DINS, SINH, NISI, SHIM, MIDS, DIMS, MIDI, HIND, HIM, IDS, DIS, HID, INS, SIM, DIN, HIS