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Level 19 - TWEIRN
The answer to this puzzle is:
Words: TWINER, NITRE, TWIER, REWIN, TWINE, INERT, NITER, TRINE, REIN, RITE, TERN, TINE, NITE, WEIR, WENT, WERT, WREN, WRIT, NEWT, IRE, WEN, NIT
Bonus words:
TWINER, NITRE, TWIER, REWIN, TWINE, INERT, NITER, TRINE, REIN, RITE, TERN, TINE, NITE, WEIR, WENT, WERT, WREN, WRIT, NEWT, IRE, WEN, NIT