Why there FM and not WFM Please answer..
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Let somebody else correct and rectify, but I think this is it :
FM is FIDE Master; WFM is Woman FIDE Master; WGM is Woman Grandmaster.
FM can be male or female.
What is a WNM ?
By the way, you write ...there is a WFM... and ... why not WFM...
Thanks for commenting sirs 
As there is WGM, WFM and WNM then why not WFM