يُوصَفُ بِهَا الْأَخِيرَانِ فَقَطْ
Only the latter two are described as baligh.
أَيِ الْكَلَامُ وَالْمُتَكَلِّمُ دُونَ الْمُفْرَدِ
That is, discourse and speaker, but not an isolated word.
Fasaha was attributed to three subjects; balagha is attributed to two. The individual word drops out of the technical attribution. This matters because the clarity or familiarity of a word does not by itself warrant calling it a baligh word in the terminology adopted here.