Denshi Jisho — Online Japanese dictionary

ぼう certain; one
Noun, Prefix 
ぼうし certain person; unnamed person
Noun 
ぼうし a certain publication
Noun 
それがし 1: (Obsolete term) someone;
2: I; personal pronoun
Pronoun, No-adjective 
なにがし 1: certain person; certain amount; Mr So-and-so;
2: I (personal pronoun)
Pronoun, No-adjective 
ぼうげつ a certain month
Temporal noun 
ぼうこく certain country
Noun 
ぼうしゃ certain company; unnamed company
Noun 
ぼうしょ certain place
Noun 
ぼうじつ certain day
Temporal noun 
ぼうぼう so-and-so
Noun 
ぼうぼう so-and-so
Noun 
ぼうしょう a certain ministry; an unspecified ministry
Noun 
高校 ぼうこうこう a certain high school
Noun 
の仕業 ぼうのしわざ the work (doings) of so-and-so
Noun 
かの金 なにがしかのかね a certain sum of money; some money
Noun 

You can also

Look up kanji details for 某 それがし.

Try a Yahoo Jisho search for 某 それがし .
Try a Goo Jisho search for 某 それがし .
Try a Google search for 某 それがし .