
1) Abrocome 2) Agouti 3) Capibara 4) Capybara 5) Cavy 6) Chin chillon 7) Coypu 8) Dormouse 9) Gerbil 10) Gerbille 11) Hamster 12) Hedgehog 13) Jerboa 14) Lemming 15) Marmot 16) Mouse 17) Musquash 18) Nutria 19) Paca 20) Porcupine 21) Rat 22) Ratlike 23) Rodent 24) Sewellel 25) Squirrel 26) Viscacha 
Found on 
https://www.crosswordclues.com/clue/gnawer

1) Beaver or dog, at times 2) Beaver, at times 3) Dog with a bone 4) Eutherian 5) Eutherian mammal 6) Gnawing animal 7) Mouse 8) Placental 9) Placental mammal 10) Rodent 11) Who chewed out Wagner 
Found on 
https://www.crosswordclues.com/clue/gnawer

• (n.) One who, or that which, gnaws. • (n.) A rodent.
Found on 
http://thinkexist.com/dictionary/meaning/gnawer/
 Gnaw'er  noun   1.
Gnaw'er  noun   1.  One who, or that which, gnaws.  
 2.  (Zoology) A rodent. 
Found on 
http://www.encyclo.co.uk/webster/G/39
  No exact match found.