Letters that make IRS
s, r, i are letters that make 'IRS'
airs, firs, mirs, sirs, kirs are words created by adding a letter to 'IRS'
1 possible definitions for 'IRS'
Under this definition, irs is a noun and has the following properties:
Internal Revenue Service has the same meaning as IRS
'IRS' can be a type of federal agency, government agency, office, bureau, authority, agency.
'IRS' can be a part of Department of the Treasury, Treasury Department, Treasury, United States Treasury.