Reader n. : One who reads.

Reader n. : One whose distinctive office is to read prayers in a church.

Reader n. : One who reads lectures on scientific subjects.

Reader n. : A proof reader.

Reader n. : One who reads manuscripts offered for publication and advises regarding their merit.

Reader n. : One who reads much; one who is studious.

Reader n. : A book containing a selection of extracts for exercises in reading; an elementary book for practice in a language; a reading book.

Example:
How does a memory card Reader work for a camera?

Taxonomy
Google Reader, Google, one place, checks, news sites, friends and family, totally free, modern browsers, software, Google Home.

Defination from the web:
Customizable web-based aggregator for feeds from news sites, blogs, and other sites with a sharing facility.