ply in WordNet English dictionary

1. give what is desired or needed, especially support, food or sustenance
   "The hostess provided lunch for all the guests"
   provide  supply  ply  cater 
   
2. use diligently
   "ply your wits!"
   ply 
   
3. wield vigorously
   "ply an axe"
   ply 
   
4. join together as by twisting, weaving, or molding
   "ply fabric"
   ply 
   
5. travel a route regularly
   "Ships ply the waters near the coast"
   ply  run 
   
6. apply oneself diligently
   "Ply one's trade"
   ply 
   

1. (usually in combinations) one of several layers of cloth or paper or wood as in plywood
   ply 
   
2. one of the strands twisted together to make yarn or rope or thread; often used in combination
   "three-ply cord"; "four-ply yarn"
   ply