This is the 795th most frequent Japanese word.
男
Man; male.
The word '男' in this sentence refers to 'man' as a person of male gender.
彼は正直な男です。
He is an honest man.
Here '男' is used to specify 'that man' as the subject in a description.
その男は公園でジョギングをしています。
That man is jogging in the park.
In this sentence, '男' is part of the phrase '男らしく', meaning 'manly', referring to characteristics associated with being a man.