Q is for . . . Questionable Q Words.

I love the game of Scrabble. 

 The more I play it, the more vocabulary I learn. Some online games have a dictionary tool that lets you check if a set of letters make a word, but I have an unwritten rule that I try find the meaning of any word that I play. So I've learned the meaning of quite a few, especially those beginning with the letter Q.

Do you know the meaning of these words? 

 1. QUAY - (Hint: water) 

 2. QUERN - (Hint: grain)

 3. QIVIUT - (Hint: rare hair) 

 4. QUAHOG - (Hint: seashell)

 5. QUANT - (Hint: gondola) 

 (I'll post the answers in the comment box.)