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America is the only country to actually use a WMD. Think about it from Saddam's or 3rd party's point of view... and the demand/argument begins to look hypocritical.
No, America is the only country to use a nuclear weapon against an opponent. WMDs can also be Biological or Chemical weapons. Saddam used chemical weapons in the Iran/Iraq war and against the Kurds.
Although there had been a claim that Saddam was trying to build a nuke, the Bush administration later admitted that this had been a miistake.
The USA has used WMDs, but then, many countries have used chemical or biological WMDs.
There are plenty of differences in context between the USAs use of the nuke in WW2 and Saddam's use of chemical weapons in the Iran/Iraq war.
The US used 2 WMDs against an enemy who had been the aggressor. Saddam started the Iran/Iraq war and used WMDs liberally throughout.
There are various arguments for and against the US use of the nuclear weapon, however I think that on balance, the US was probably more justified in its use of the nuclear weapon (to protect democracies from a nationalistic agresssor) than Saddam (to conquer land and people).