俊士 is read as しゅんし (shunshi) and means genius.
しゅんし
shunshi
しゅんえい
excellence
しゅんそく
person of great talent
しゅんばつ
uncommon
しゅんしゅう
genius
どうし
fellow
りきし
Deva king
だいぎし
parliamentarian
べんごし
lawyer
へいし
soldier
はかせ
instructor at the imperial court (ritsuryō period)
ぶし
samurai
さむらい
man in attendance (on a person of high standing)