平ら: flat, even, level, smooth, having no variation in altitude

平: a male given name / 平: a surname

太平:

testing on a living person

人日: also known as nanakusa no sekku (七草の節句, ななくさのせっく: "The festival of seven herbs"); one of the five seasonal festivals, (五節句, gosekku). It is celebrated on January 7.

仁: a male given name

人: on for person / 仁: benevolence / ジン: gin / 壬: ninth heavenly stem / 陣: (military) camp, formation / 神: god

人: person from that group; -ian, -ish / 人: person who does that thing

人事: human affairs; personnel affairs; human resources; HR / 仁慈: benevolence

人選: choosing a person