The channeler said she could communicate with deceased family members.

channeler 是由名词 channel（通道）加上后缀 -er（表示"做...的人"）构成的名词。channel 在这里指"灵性通道"，即与灵界沟通的途径。channeler 指"能够作为媒介与灵界沟通的人"，即"通灵者"。