baroness / barrenness are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
baroness: (noun) a noblewoman who holds the rank of baron or who is the wife or widow of a baron.
barrenness: (noun) the state (usually of a woman) of having no children or being unable to have children.
baroness: b·EH·r·ah·n·ih·s
barrenness: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)