Meaning of だいどうし in Japanese

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Definition of だいどうし

だいどうし(daidoushi) 【代動詞】

だいどうしょうい(daidoushoui) 【大同小異】

(adj-na, n, adj-no) essentially the same with only minor differences
この二つは大同小異だ。
There is not much difference between the two.

だいどうしょうにん(daidoushounin) 【大道商人】