To be simple and short, no. It is not because the only real definition of IZ is a graffiti artist named IZ, or perhaps nicknames IZ, so no it is not allowed. And the spell check on this answer box doesn't recognize IZ.
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No. Hiv is not allowed in Scrabble.
No. Suq is not allowed in Scrabble.
No. Ni is not allowed in Scrabble.
No. Abbreviations are not allowed in Scrabble. DIY = Do It Yourself
No. Tn is not allowed in Scrabble. If you are thinking of TN as an abbreviation, abbreviations are not allowed in Scrabble.