This study analyzes the words in the final part of Noh, especially while enterring Nirvana.

On analyzing the dream Nohs (13 pieces) before Zeami's Sandou was created in 1423, we discover that the Site enters Nirvana or desires to enter Nirvana or becomes God in the end.

After Sandou's creation, we can see the same dream Nohs (12 pieces). However, we identify the return of the Site of the 10 works (Nishikigi, Obasute, Yashima, Nomori, Yamanba, Motomezuka, Tamamizu, Izutu, Tamamizu, and Matura) to the Noh's original place without entering Nirvana in the end.

We further analyze the aforementioned 10 works, alongside Matukaze and Yorimasa of Zeami's Noh as well as Bashou and Teika of Zenchiku's Noh.

The final sentence of Matukaze that contains the natural features inspires the final sentence of Nishikigi and Obasute which in turn inspires Bashou's final sentence. Yorimasa constructs Motomezuka's and Tamamizu's final sentence which inspires Teika's final sentence.

We also analyze Yuri Yamaki's opinion that Zenchiku first made the Nohs (Bashou, Teika, and Obasute) where the Site returns to the Noh's original location at the end of the Noh. This study helps conclude that Zeami first created Nishikigi, Obasute and Motomezuka which returns to Noh's originall place without entering Nirvana at the end of it.

Affected by these works, Zenchiku created Bashou and Teika, which differ from Zeami's works.