Style compounds open or closed per Merriam-Webster Online (www.merriam-webster.com/) or the latest edition of the printed dictionary. For items not included in the dictionary, consult CMoS: www.chicagomanualofstyle.org/16/ch07/ch07_toc.html.

See also the CMoS hyphenation table: www.chicagomanualofstyle.org/16/images/ch07_tab01.pdf.