ぜんせい全盛zensei
1.

The state of being at the peak of activity or flourishing, often referring to a specific period of great success or vitality.

2.

A time when a business or trade experiences a significant increase in customers and profitability, often associated with cultural or social prominence.

3.

A display of ostentation or pride, particularly in a way that seeks to impress others or showcase one's status.

Example:

その歌手はその歌のときが全盛でした。

ぜんせいき全盛期zenseiki
1.

The period during which someone or something experiences the highest level of success, popularity, or influence.

2.

A time characterized by significant growth, achievement, and flourishing in activities, culture, or performance.

3.

An era marked by peak accomplishments or the most vibrant phases of development in a particular context.

Example:

どんな犬にも全盛期がある。

ぜんせいじだい全盛時代zenseijidai
1.

特定の分野や文化において、その活動や成果が最も活発で栄えている時期を指す。

2.

歴史や社会において、特に顕著な成長や発展が見られ、人々の生活や価値観が豊かに広がる期間を意味する。

Example:

彼女にも全盛時代があった。