顧問 （コモン） adviser, advisor, consultant

顧客 （コキャク） customer, client, patron

一顧 （イッコ） slightest notice, slightest consideration, slightest attention, a little thought, glance

後顧 （コウコ） looking back, worry, anxiety

顧みる （かえりみる） to look back on (the past), to reflect on, to reminisce about, to look behind (at), to turn round (and look), to look over one's shoulder, to consider, to concern oneself about, to take notice of, to pay attention to, to take into consideration