This is the 1158th most frequent Japanese word.
園長
Principal of a kindergarten or director of a garden/park.
Here, "園長" refers to the principal (typically of a kindergarten or nursery school) who holds a significant managerial role within the institution.
その学校の園長はとても親切です。
The principal of that school is very kind.
"園長" in this instance specifies the director or head of a kindergarten, signifying assuming a leadership position.
私の姉がこの幼稚園の園長になりました。
My older sister became the director of this kindergarten.
In this sentence, "園長" represents the figure of authority who delivers remarks or openings at events, reflecting their official capacity.