As a verb renouncing

is (renounce).

As a adjective abdicant is

{{context|rare|lang=en}} abdicating; renouncing {{defdate|mid 17^th century}}{{reference-book | last =| first = | authorlink = | coauthors = | editor =brown, lesley | others = | title = the shorter oxford english dictionary | origdate = | origyear = 1933| origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = 5th | date = | year =2003| month = | publisher =oxford university press | location =oxford, uk | language = | id = | doi = | isbn =978-0-19-860575-7 | lccn = | ol = | pages =1| chapter = | chapterurl = | quote =}}.

As a noun abdicant is

one who abdicates {{defdate|mid 17^th century}}.