bachelor
/ˈbætʃ.ə.lə(ɹ)/noun
A person, especially a man, who is socially regarded as able to marry, but has not yet.
Related words
spinsterA woman who has never been married, especially one past the typical marrying age according to social traditions.widowerA man whose spouse has died (and who has not remarried); a man in relation to his late spouse; masculine of widow.nannyA child's nurse.anniversaryA day that is an exact number of years (to the day) since a given significant event occurred.babysitterA person who cares for one or more babies or children for a short period of time in place of their legal guardians.honeymoonThe period of time immediately following a marriage.