Aliasing lead → leash
Link to alias

Reason:

Synonymous tags, with leash being the far more populous tag (~16,000 vs. 50).

it's also an element.

kamimatsu said:
it's also an element.

None of the lead posts I saw had any relation to the element, though I suppose lead_(element) or lead_(metal) could be used if a post required such a tag?