
1) Freshwater worm 
Found on 
https://www.crosswordclues.com/clue/naid

• (n.) Any one of numerous species of small, fresh-water, chaetopod annelids of the tribe Naidina. They belong to the Oligochaeta. • (n.) Any one of numerous species of small, fresh-water, chaetopod annelids of the tribe Naidina. They belong to the Oligochaeta.
Found on 
http://thinkexist.com/dictionary/meaning/naid/
 Na'id  noun
Na'id  noun [ See 
 Naiad .] 
 (Zoology) Any one of numerous species of small, fresh- water, chætopod annelids of the tribe 
 Naidina . They belong to the 
 Oligochæta . 
Found on 
http://www.encyclo.co.uk/webster/N/1
  No exact match found.