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Level 10 - EGEIRNC
The answer to this puzzle is:
Words: CERING, NICER, RENIG, GENIC, CINE, CIRE, EGER, CERE, GIEN, ERNE, GREE, REIN, GIRN, CIG, ERE, GEN, ENG, GEE, REG, IRE, NEE, GIN, REC, ERG
Bonus words:
CERING, NICER, RENIG, GENIC, CINE, CIRE, EGER, CERE, GIEN, ERNE, GREE, REIN, GIRN, CIG, ERE, GEN, ENG, GEE, REG, IRE, NEE, GIN, REC, ERG