derive the kana for a voiced-onsetted mora from the kana for a base voiceless-onsetted mora; / (informal) orthographically convey a guttural tone, such as that of a cry or scream

needed, necessary

need, necessity

derive the kana for a mora onsetted with /p/ from the kana for a mora onsetted with /h/

a letter or character (symbol for a sound or a word) / (linguistics) script, writing system / (specific to Japanese) a written mora, a kana / writing in general, written words

a letter, a character (symbol for a sound or a word) / (linguistics) script, writing system / (specific to Japanese) a written mora, a kana / writing in general, written words

necessary evil

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness