good command of, full use of

(rare) The hiragana syllable ゐゃ (wya). Its equivalent in katakana is ヰャ (wya).

The hiragana syllable ふゃ (fya). Its equivalent in katakana is フャ (fya).

The hiragana syllable ひゃ (hya). Its equivalent in katakana is ヒャ (hya).

The hiragana syllable ぢゃ (ja). Its equivalent in katakana is ヂャ (ja).

The hiragana syllable みゃ (mya). Its equivalent in katakana is ミャ (mya).

愚者: a fool (person with poor judgement or little intelligence)

creator, maker, originator

(Internet slang) man with weak elements such as unmarried, impoverished or handicap

(literally) a weakling