it shows the influence of rasulullah sallallahu 'alaihi wasallam that words that weren't specific to him 'alaihis salam have now become so. na'at means praise and it could be the praise of anyone but when we say na'at without even saying na'at e nabi, everyone knows we mean so. seerat means life or biography but even without saying seerat an nabi people know what we mean. huzoor could be used for anyone but when we say just huzoor people know we mean our master 'alaihis salatu wassalam madina means city but without saying madina tun nabi we are understood. hadith means saying.... meelad means birth.... please add your own.