As the Head Director of the church nursery, your primary job is the children versus clergy duties.
Therefore, a more descriptive IRS job code would be 624410 - Child care day services.
The following IRS link gives other information you may need as a Self-Employed person filing a Schedule C:
*administer the sacraments,
*are considered to be a religious leader by your church,
*conduct worship services, and
*have management responsibility in the control, conduct, or maintenance of your congregation.
Based on guidelines issued by the IRS, some of the four tests, but not necessarily all, must be met in determining clergy status. This flexible approach is beneficial to many clergy because some positions relating to music, education, youth, or administration will not meet all four tests.