Which is the better word to use here ?
Each/every part of coconut tree is used by man.
I went through earlier posts regarding each / every on SE, I can distinguish between each and every in examples given in those posts e.g.
"its better to say Every apple is red instead of each apple is red"
but I am not able to decide in this sentence.
Each generally refers every X in a group of a known or finite quantity, and implies that when used - each sort of suggests an enumeration of some kind.
You would make "parts of coconut trees" a known or finite quantity if you were talking about and/or listing each part.
Each part of the coconut tree used by man; the stems, bark, leaves, etc...
If you aren't talking about the individual parts you can stick with every.
