叩 ⇒

• 口         kǒu, mouth/classifier for things with mouths (people, domestic animals, cannons, well...
• 卩         jié, "seal" radical in Chinese characters (Kangxi radical 26)

谒 ⇒

• 曷         hé, why/how/when/what/where
  • 曰         yuē, to speak/to say
  • 匃         
    • 勹         bāo, archaic variant of 包[bāo]
    • 亾         
      • 人         rén, man/person/people/CL:個|个[gè],位[wèi]
      • 乚         yà, component in Chinese characters/archaic variant of 毫[háo]/archaic variant of 乙[y...
• 讠         yán, [訁], "speech" or "words" radical in Chinese characters (Kangxi radical 149)/see also ...

叩 ⇒

• 命        mìng, life/fate/order or command/to assign a name, title etc
  • 掵        

谒 ⇒

• 蔼        ǎi, [藹], friendly
• 霭        ǎi, [靄], mist/haze/cloudy sky

叩 ⇒
叩         kòu, [敂], to knock/to kowtow, old variant of 叩[kòu]/to knock
叩击         
叩首         kòushǒu, to kowtow/also written 磕頭|磕头[kē tóu]
叩头         kòutóu, [叩頭], to kowtow (traditional greeting, esp. to a superior, involving kneeling and pres...
叩门         kòumén, [叩門], to knock on a door

谒 ⇒
谒         yè, [謁], to visit (a superior)