Stocks are particular issues of a company e.g. common stock,preference stock, bonds,convertible bonds ,loan notes etc., which you nominate when investing, with unnominated stock defaulting to common stock.

Shares are portions of those stocks.

Your question makes no sense.

while converting the shares into share stock you can adjust your share investment loss with other source of income and this will going to benefit as a tax saving.

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No, they don't. The proper term is "Shares of stock" there is converting options to buy shares into actual shares. or from Calss A ( voting shares) to classB ( non-voting shares) but there is NO such thing as converting shates to stock.

Well unless you are selling your shares of XYZ corporation and usin gthe proceeds to purchase cattle.

Shares and stock are the same thing