phoneme

system

phonology (subfield of linguistics)

systematic

Tō-on, a Sino-Japanese kanji pronunciation layer; imported to Japan beginning in the mid-Heian period and ending in the Edo period. Uncommon. / (more specifically) The later subset of above.

one thing

Short for 中国地方 (Chūgoku chihō): the Chūgoku region of Japan

the central part of a country, historically, commonly known as the capital city or the main region, where an emperor or other ruler resides / something within a country

(historical or contemporary) any of several kingdoms, empires, or states of the Chinese people

a surname