主辞 is read as しゅじ (shuji) and means subject.
しゅじ
shuji
しゅじそせいげんり
head feature principle
しゅじそせいきやく
head feature convention
しゅじくどうくこうぞうぶんぽう
head-driven phrase structure grammar
しゅせき
head
しゅよう
chief
しゅけん
sovereignty
しゅにん
person in charge
しゅやく
leading part
しゅえん
starring (in a film, play, etc.)
しゅふ
housewife
しゅかん
one's personal opinion
しゅかく
host and guest