"plies" in the noun sense
one of the strands twisted together to make yarn or rope or thread often used in combination
usually in combinations) one of several layers of cloth or paper or wood as in plywood
"plies" in the verb sense
1. provide, supply, ply, cater
give what is desired or needed, especially support, food or sustenance
"The hostess provided lunch for all the guests"
apply oneself diligently
"Ply one's trade"
3. ply, run
travel a route regularly
"Ships ply the waters near the coast"
join together as by twisting, weaving, or molding
"ply an axe"
"ply your wits!"
Source: WordNet® (An amazing lexical database of English)
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