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I am trying to kill for example a dragon head (as a "dropped item") only not all items with /kill so I want to know how to specify what type of item I want to kill without using /scoreboard
You can't. It just doesn't work. It's like saying you're trying to make a functioning (insert redstone circuit here) without turning it on.
If it's an item thrown on the ground, you can use the kill entity command here
Insert the item ID of the item you are trying to kill in the "item" spot without quotation marks
This will kill all entities with the item id entered so be careful you don't mess something up.