出典:国際連合
Vital events 1 may be defined as births, deaths, stillbirths, foetal deaths, marriages, adoptions, legitimations, recognitions, annulments, divorces and separations; in short all the events which have to do with an individual’s entrance into or departure from life together with changes in civil status 2. Records of these events are generally called vital records 3, or registration records 3. For legal reasons vital events have, in many countries, long been the object of vital registration 4 or civil registration 4. Birth registration 5, marriage registration 7 and death registration 9 use special forms as birth records 6, marriage records 8 and death records 10; these are the most common types of registration documents. The person responsible for maintaining these registers is called the registrar 11.
出典:Wiktionary
「deaths」は名詞「death」の複数形です